285
Table 10.14 Example of Correspondence between SH7709S and Synchronous DRAM
Address Pins (AMX [3:0] = 0100 (32-Bit Bus Width))
SH7709S Address Pin
Synchronous DRAM Address Pin
RAS Cycle
CAS Cycle
Function
A15
A23
A23
A13(BA1)
BANK select bank address
A14
A22
A22
A12(BA0)
A13
A21
A13
A11
Address
A12
A20
L/H
A10
Address precharge setting
A11
A19
A11
A9
Address
A10
A18
A10
A8
A9
A17
A9
A7
A8
A16
A8
A6
A7
A15
A7
A5
A6
A14
A6
A4
A5
A13
A5
A3
A4
A12
A4
A2
A3
A11
A3
A1
A2
A10
A2
A0
A1
A9
A1
Not used
A0
A0
A0
Not used
Burst Read: In the example in figure 10.15 it is assumed that four 2M
×
8-bit synchronous
DRAMs are connected and a 32-bit data width is used, and the burst length is 1. Following the Tr
cycle in which ACTV command output is performed, a READ command is issued in the Tc1, Tc2,
and Tc3 cycles, and a READA command in the Tc4 cycle, and the read data is accepted at the
rising edge of the external command clock (CKIO) from cycle Td1 to cycle Td4. The Tpc cycle is
used to wait for completion of auto-precharge based on the READA command inside the
synchronous DRAM; no new access command can be issued to the same bank during this cycle,
but access to synchronous DRAM for another area is possible. In the SH7709S, the number of Tpc
cycles is determined by the TPC bit specification in MCR, and commands cannot be issued for the
same synchronous DRAM during this interval.
The example in figure 10.14 shows the basic cycle. To connect low-speed synchronous DRAM,
the cycle can be extended by setting WCR2 and MCR bits. The number of cycles from the ACTV
command output cycle, Tr, to the READ command output cycle, Tc1, can be specified by the
RCD bits in MCR, with values of 0 to 3 specifying 1 to 4 cycles, respectively. In case of 2 or more
cycles, a Trw cycle, in which an NOP command is issued for the synchronous DRAM, is inserted
between the Tr cycle and the Tc cycle. The number of cycles from READ and READA command
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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