Rev. 2.00, 09/03, page 213 of 690
Figure 7.16 shows a timing chart in burst read. In burst read, an ACTV command is output in the
Tr cycle, the READ command is issued in the Tc1, Tc2, and Tc3 cycles, the READA command is
issued in the Tc4 cycle, and the read data is received at the rising edge of the external clock
(CKIO) in the Td1 to Td4 cycles. The Tap cycle is used to wait for the completion of an auto-
precharge induced by the READ command in the SDRAM. In the Tap cycle, a new command
will not be issued to the same bank. However, access to another CS space or another bank in the
same SDRAM space is enabled. The number of Tap cycles is specified by the TRP[1:0] bits of
the CS3WCR register.
Tc4
CKIO
A25 to A0
CSn
RD/
WR
RASU
/
L
DQMxx
*
2
D31 to D0
BS
Tap
DACKn
*
3
Tr
Tc2
Tc3
Tc1
Td4
Tde
Td2
Td3
Td1
A12/A11
*
1
CASU
/
L
Notes: 1. Address pin to be connected to the A10 pin of SDRAM.
2. xx is UU, UL, LU, or LL.
3. The waveform for DACKn is when active low is specified.
Trw
Tw
Figure 7.16 Synchronous DRAM Burst Read Wait Specification Timing
(Auto Precharge)
Содержание SH7705
Страница 2: ......
Страница 46: ...Rev 2 00 09 03 page xlvi of xlvi Appendix Table A 1 I O Port States in Each Processing State 679 ...
Страница 70: ...Rev 2 00 09 03 page 24 of 690 ...
Страница 194: ...Rev 2 00 09 03 page 148 of 690 ...
Страница 284: ...Rev 2 00 09 03 page 238 of 690 ...
Страница 338: ...Rev 2 00 09 03 page 292 of 690 ...
Страница 354: ...Rev 2 00 09 03 page 308 of 690 ...
Страница 374: ...Rev 2 00 09 03 page 328 of 690 ...
Страница 420: ...Rev 2 00 09 03 page 374 of 690 ...
Страница 476: ...Rev 2 00 09 03 page 430 of 690 ...
Страница 482: ...Rev 2 00 09 03 page 436 of 690 ...
Страница 552: ...Rev 2 00 09 03 page 506 of 690 ...
Страница 630: ...Rev 2 00 09 03 page 584 of 690 ...
Страница 739: ...SH7705 Group Hardware Manual REJ09B0082 0200O ...