Memory; Sh7285 On-Chip Memory; Sram - Renesas M3A-HS85 User Manual

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2.3 Memory

2.3.1 SH7285 On-Chip Memory

The SH7285 includes a 768-Kbytes flash memory and 32-Kbytes RAM.

2.3.2 SRAM

Two Mbytes of SRAM can be mounted on the M3A-HS85 (Not mounted). In the M3A-HS85 specification, 3.3V
power is supplied to SRAM so that SH7285 should be used in 3.3V when SRAM is mounted (CPU power supply
switch jumper (JP1) should be set to "2-3"). SRAM is controlled by the bus state controller built into SH7285. The
address spaces of SRAM can be switched to CS0 space, CS2 space, and CS6 space by the pin function controller
setting of SH7285.
Table 2.3.1 lists the SRAM specifications. Figure 2.3.1 shows the block diagram for the connection between
SH7285 and SRAM.
Part Number
R1LV1616RSA-7S
Figure 2.3.1 Block Diagram for Connection Between SH7285 and SRAM
Rev.1.04 2008.7.10
REJ10J1564-0104
Table 2.3.1 SRAM Specifications
Bus size
16 bit 2 Mbytes (16-bit x 1M word x 1 pc.)
SH7285
PB8/A20 - PC1/A1
PD15/D15 - PD0/D0
PB11/CS0/CS2/CS6
PA14/RD
PA8/RDWR
PA12/WRH
PA13/WRL
Capacity
R1LV1616RSA-7
16M-bit SRAM
(1M Word ×16bit)
20
A19 - A0
16
DQ15 - DQ0
3.3V
BYTE
CS1
Reset CS2
OE
WE
UB
LB
Functional Overview
2.3 Memory
Package
48-pin TSOP (20 x 12mm)
2-4