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Section 12 Bus State Controller (BSC)
Rev. 4.00 Sep. 14, 2005 Page 352 of 982
REJ09B0023-0400
number of cycles from the Tc1 cycle where the READ command is output to the Td1 cycle where
the read data is latched can be specified for the CS2 and CS3 spaces independently, using the
A2CL1 and A2CL0 bits in the CS2WCR register or the A3CL1 and A3CL0 bits in the CS3WCR
register and WTRCD0 bit in the CS3WCR register. The number of cycles from Tc1 to Td1
corresponds to the SDRAM CAS latency. The CAS latency for the SDRAM is normally defined
as up to three cycles. However, the CAS latency in this LSI can be specified as 1 to 4 cycles. This
CAS latency can be achieved by connecting a latch circuit between this LSI and the SDRAM.
A Tde cycle is an idle cycle required to transfer the read data into this LSI and occurs once for
every burst read or every single read.
Tc4
CKIO
A25 to A0
CSn
RD/
WR
RASL
,
RASU
DQMxx
D31 to D0
BS
(Tap)
DACKn
*
2
Tr
Tc2
Tc3
Tc1
Td4
Tde
Td2
Td3
Td1
A12/A11
*
1
CASL
,
CASU
Notes: 1. Address pin to be connected to pin A10 of SDRAM.
2. The waveform for
DACKn
is when active low is specified.
Figure 12.18 Burst Read Basic Timing (CAS Latency 1, Auto Pre-Charge)
Summary of Contents for HD6417641
Page 2: ...Rev 4 00 Sep 14 2005 Page ii of l...
Page 7: ...Rev 4 00 Sep 14 2005 Page vii of l...
Page 11: ...Rev 4 00 Sep 14 2005 Page xi of l USB Universal serial bus WDT Watch dog timer...
Page 12: ...Rev 4 00 Sep 14 2005 Page xii of l...
Page 28: ...Rev 4 00 Sep 14 2005 Page xxviii of l...
Page 204: ...Section 4 Clock Pulse Generator CPG Rev 4 00 Sep 14 2005 Page 154 of 982 REJ09B0023 0400...
Page 212: ...Section 5 Watchdog Timer WDT Rev 4 00 Sep 14 2005 Page 162 of 982 REJ09B0023 0400...
Page 228: ...Section 6 Power Down Modes Rev 4 00 Sep 14 2005 Page 178 of 982 REJ09B0023 0400...
Page 246: ...Section 8 X Y Memory Rev 4 00 Sep 14 2005 Page 196 of 982 REJ09B0023 0400...
Page 318: ...Section 11 User Break Controller UBC Rev 4 00 Sep 14 2005 Page 268 of 982 REJ09B0023 0400...
Page 454: ...Section 12 Bus State Controller BSC Rev 4 00 Sep 14 2005 Page 404 of 982 REJ09B0023 0400...
Page 504: ...Section 14 U Memory Rev 4 00 Sep 14 2005 Page 454 of 982 REJ09B0023 0400...
Page 566: ...Section 17 Compare Match Timer CMT Rev 4 00 Sep 14 2005 Page 516 of 982 REJ09B0023 0400...
Page 868: ...Section 21 A D Converter Rev 4 00 Sep 14 2005 Page 818 of 982 REJ09B0023 0400...
Page 914: ...Section 23 I O Ports Rev 4 00 Sep 14 2005 Page 864 of 982 REJ09B0023 0400...
Page 956: ...Section 24 List of Registers Rev 4 00 Sep 14 2005 Page 906 of 982 REJ09B0023 0400...
Page 1016: ...Section 25 Electrical Characteristics Rev 4 00 Sep 14 2005 Page 966 of 982 REJ09B0023 0400...
Page 1024: ...Appendix Rev 4 00 Sep 14 2005 Page 974 of 982 REJ09B0023 0400...
Page 1032: ...Rev 4 00 Sep 14 2005 Page 982 of 982 REJ09B0023 0400 X X Y data addressing 52 X Y memory 193...
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