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SH7014 bảng dữ liệu(PDF) 162 Page - Renesas Technology Corp

tên linh kiện SH7014
Giải thích chi tiết về linh kiện  32-Bit RISC Microcomputer
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nhà sản xuất  RENESAS [Renesas Technology Corp]
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SH7014 bảng dữ liệu(HTML) 162 Page - Renesas Technology Corp

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8. Bus State Controller (BSC)
Rev.5.00 Sep. 27, 2007 Page 128 of 716
REJ09B0398-0500
8.4.2
Basic Timing
This LSI supports 2 CAS format DRAM access. The DRAM access basic timing is a minimum of
3 cycles for normal mode. Figure 8.7 shows the basic DRAM access timing. DRAM space access
is controlled by
RAS, CASx and RDWR signals. The following signals are associated with
transfer of these actual byte locations:
CASH (bits 15 to 8) and CASL (bits 7 to 0). However, the
signals for ordinary space,
WRx and RD, are also output during the DMAC single transfer column
address cycle period. T
p is the precharge cycle, Tr is the RAS assert cycle, Tc is the CAS assert
cycle and T
c2 is the read data fetch cycle.
Tp
Tr
Tc1
Tc2
CK
Write
Read
Address
Data
RAS
CASx
RDWR
Data
RDWR
CASx
RAS
Row
Column
Figure 8.7 DRAM Bus Cycle (Normal Mode, TPC = 0, RCD = 0, No Waits)



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