317
Memory Card Interface Burst Timing: In the SH7709S, when the IC memory card interface is
selected, page mode burst access mode can be used, for read access only, by setting bits A5BST1
and A5BST0 in BCR1 for physical space area 5, or bits A6BST1 and A6BST0 in BCR1 for area
6. This burst access mode is not stipulated in JEIDA version 4.2 (PCMCIA2.1), but allows high-
speed data access using ROM provided with a burst mode, etc.
Burst access mode timing is shown in figures 10.36 and 10.37.
CKIO
Tpcm1
A25 to A4
CExx
A3 to A0
RD/
WR
RD
(read)
D15 to D0
(read)
BS
Tpcm2
Tpcm1
Tpcm2
Tpcm1
Tpcm2
Tpcm1
Tpcm2
Figure 10.36 Basic Timing for PCMCIA Memory Card Interface Burst Access
Содержание SH7709S
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Страница 292: ...273 T1 CKIO A25 to A0 CSn RD WR RD D31 to D0 WEn D31 to D0 BS T2 Read Write Figure 10 6 Basic Timing of Basic Interface ...
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