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SH7708 数据表(PDF) 317 Page - Renesas Technology Corp |
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SH7708 数据表(HTML) 317 Page - Renesas Technology Corp |
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317 / 633 page  299 10.4.4 PCMCIA Area Access In the SH7708 Series (SH7708, SH7708S, SH7708R), if an SDRAM auto-refresh (CAS-before- RAS) request occurs during an area 6 PCMCIA area access, CS6 is simultaneously asserted, in addition to the CS signal for the area to be accessed, when the auto-refresh is performed. If the following specifications are made, CS3 and CS6 will be asserted simultaneously: Area 3: SDRAM Area 6: PCMCIA CS6 remains asserted until the end of the following PCMCIA bus cycle. PCMCIA area CS (CS6) asserted PCMCIA cycle CS (CS3) asserted in CAS-before-RAS refresh Auto-refresh cycle CKIO CS3 RAS BS CS6 Restrictions: When using PCMCIA in area 6 and also using SDRAM, the area 6 CS signal (CS6) may be asserted earlier than usual, at the same time as the preceding auto-refresh cycle. Remedy: This anomaly occurs only in area 6. There is no problem with area 5. Therefore, if use of both SDRAM and PCMCIA in the system is being considered, area 5 should be used. If area 6 is used, the system design should allow for CS to be asserted early without causing any problems. |
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