Design Guide Comparison between




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EPSON

Design Guide


Comparison between

CARD-586 and CARD-686

Revision B (March 15, 1999)


(1) All specifications of this device are subject to change without notice. The information in this brochure has been checked and is believed to be reliable. However, no responsibility can be assumed for the use of any circuits shown nor for infringements of patents which may result from their use, (2) This document contains technology relating to strategic products controlled under the Foreign Exchange and Foreign Trade Control Law of Japan. This document or a portion thereof should not be exported without obtaining an export license from the ministry of International Trade and Industry in accordance with the above law. (3) IBM PC, PC AT, CGA and IBM are registered trademarks of International Business Machines Corporation, U.S.A.

EPSON assumes no responsibility of liability for (1)any errors or inaccuracies contained in the information herein and (2) the use of the information or a portion thereof in any application, including any claim for (a) copyright or patent infringement of (b) direct, indirect, special or consequential damages. There are no warranties extended or granted by this document. The information herein is subject to change without notice from EPSON.

CARD-686 Application note supersedes the contents hereon.



1. About this document


This document is prepared to provide necessary information when a hardware design is migrated from CARD-586 to CARD-686. It focuses the differences between CARD-586 and CARD-686 characteristics. Refer to “CARD-686 Hardware Manual” and “CARD-686 Application Manual” in more detail.

2. About CARD-686
CARD-686 is designed as a high-end model of the CARD-PC product line. It is a plug-in compatible with the other CARD-PC product group, from the electrical point of view, however, the following consideration should be taken into the hardware design.

3. The difference between CARD-686 and CARD-586
3.1 Comparison table

Item

CARD-686

CARD-586

CPU

AMD K6 233MHz

64KB write back cache



AMD 5x86 133MHz

16KB write back cache



Memory size

32MB, 64MB

16MB, 32MB, 48MB

ISA BUS pin characteristics

3V output and 5V output are mixed.

All output signals are driven by 5V rail.

Power consumption

8W typical, 13W maximum

4W typical, 7W maximum

Temperature

Tcase = 85 degree C

Tcase = 70 degree C

Dimension and Weight

  1. 6mm x 54.0mm x 16.75mm

Weight : 91g

  1. 6mm x 54.0mm x 7.5mm

Weight : 65g

Case

No

Yes

CARD stopper (clip)

Not prepared

Prepared

3.2 Details

(1) CPU


CARD-686 employs AMD K6 CPU, which runs at 233MHz for first release of CARD-686. Because of the faster CPU clock, larger L1 cache (64KB) and write back cache policy, it offers 4 times faster CPU and memory performance than the predecessor CARD-586, 133MHz.
(2) Memory

CARD-686 comes with 32MB DRAM or 64MD DRAM. No secondary cache, no flash option available.




  1. ISA-bus signal characteristics

CARD-686 has two devices driving ISA-bus and other signals, which are ISP0016B and SPC8221. ISP0016B is a 3.3V device, and SPC8221 is a 5V device. During a bus cycle of ISP0016B, the output signal is derived from 3.3V rail, and during a bus cycle of SPC8221, the output signal is derived from 5V rail. Although both devices are compatible with TTL output, the output signal looks odd during ISP0016B bus cycle. It is driven close to 3.3V by ISP0016B within a specified rise time, and it rises to 5V slowly, because of a pull up resistor between the signal and 5V. The table below describes the difference of such characteristics.

Signal name

CARD-686

CARD-586

Pin type

Termination

Pin type

Termination

LA[23:17]

IO3/5

HOLD

IO

HOLD

SA[19:0]

IO3/5

HOLD

IO

HOLD

SD[15:0]

IO3/5

47KPU

IO

50KPU

IOR#

IO3/5

47KPU

IO

50KPU

IOW#

IO3/5

47KPU

IO

50KPU

MEMR#

IO3/5

47KPU

IO

50KPU

MEMW#

IO3/5

47KPU

IO

50KPU

SBHE#

IO3

47KPU

IO

HOLD

BALE

O3

---

O

---

AEN

O3

22ST

O

---

IOCHRDY

IO3 OD

1KPU

IO OD

1KPU

REF#

IO3 OD

1KPU

IO OD

1KPU

SCLK

O3

33ST

O

22ST

RESETDRV

O3

22ST

O

---

[Termination description]



  • HOLD : Connected to a bus holder

  • ??PU : Pulled up by ??ohm resistance to VCC5

  • ??ST : ??ohm series damping resistance

[Pin type description]

  • O : VCC5-level output

  • O3 : VCC3-level output (it rises to 5V if a pull up resistor is attached)

  • IO : VCC5-level output, bi-directional

  • IO3 : VCC3-level output, bi-directional (5V tolerant)

In case of high level output, firstly bus controller (ISP0016) drives signal to VCC3-level, then signal rises slowly to VCC5-level by an internal pulled up resistor.

  • IO3/5 : Mixed VCC3/VCC5-level output, bi-directional (5V tolerant)

In case of high level output, if IO controller (SPC8221) drives signal, the output signal is VCC5-level, if bus controller (ISP0016) drives signal, firstly bus controller (ISP0016) drives signal to VCC3-level, then signal rises slowly to VCC5-level by an internal pulled up resistor.

  • IO3 OD : VCC3-level bi-directional, open drain output (5V tolerant)

In case of high level output, firstly bus controller (ISP0016) drives signal to VCC3-level, then signal rises slowly to VCC5-level by an internal pulled up resistor.

(4) Power consumption

CARD-686 consumes power as twice as much of CARD-586 typically. The power supply must supply enough rush and maximum current and meet the voltage tolerance specification.
(5) Temperature

The temperature measuring point of CARD-686 is different from that of CARD-586.

Since CARD-686 has no external case, Tcase is same as CPU (AMD-K6) specification.

(6) Dimension and Case

CARD-686 has no case, because it is constructed of 2 PCBs that sizes are almost same and the height dimension becomes bigger than CARD-586.
(7) CARD stopper (tool)

Because the structure and height dimension of CARD-686 is not same as CARD-586, CARD stopper (SEK6676P01) can not be used. Design CARD-686 fixture on the mother board. Example is shown on section 4.6.





  1. Design Consideration


4.1 General

Because CARD-686 uses the same IO controller (SPC8221) and the VGA controller (SPC8110) as those of CARD-586, these two cards are functionally compatible. However, there are several differences between them as described above. Please evaluate the system carefully with CARD-686.


4.2 ISA-bus signal characteristics

It is highly recommended to avoid using HCMOS device as ISA-bus peripherals. Because HCMOS requires C-MOS level input voltage, where CARD-PC outputs TTL compatible output voltage (2.4V min). Use HCT or ACT to receive ISA-bus signals.


4.3 Power Supply

  • The power supply requirement for VCC3 source is 3.3V +0.3V/-0.15V (tolerance = 5% ). This is compatible with CARD-586. However it is recommended to set VCC3 at 3.25V to avoid voltage DIP.



4.4 EMI and Static noise

Because the CARD-686 has no case and the CPU clock is much faster than CARD-586, consider the countermeasure against EMI and Static noise issues on the circuit design, PCB A/W design and case design of the system.


4.5 Temperature

  • Because CARD-686 power consumption is much higher than CARD-586, a heat sink or a FAN are recommended. Refer the Application Note for more details.

  • Following table shows the temperature measurement without a heat sink or air flow. To meet CARD-686 Tcase specification (85 degree C) without a heat sink or air flow, Ta (ambient temperature) should be lower than about 26 degree C.







Ta

Tcase

delta T

CARD-686

25.7 degree C

83.5 degree C

57.8 degree C

CARD-586

45.0 degree C

68.8 degree C

23.8 degree C


4.6 Mounting and Fixture

Following figure shows an example how to fix CARD-686 on the mother board. Keep the distance (A) between the CARD-686 and it’s socket in 0.5mm or closer.





Page Rev. B


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