Renesas M3A-HS60, Руководство пользователя

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Functional Overview
2.3 Memory
Rev.1.00 June 1,2005 2-4
REJ11J0002-0100Z
2
2.3 Memory
The M3A-HS60 includes the internal RAM of the SH7206 (128 Kbytes), external Flash memory, and external SDRAM.
These memory chips are detailed below.
2.3.1 SH7206's Internal RAM
The SH7206 contains an internal 128-Kbyte RAM.
2.3.2 Flash Memory M5M29KT331AVP (included as standard equipment)
The M3A-HS60 includes the Flash memory shown in Table2.3.1 as standard equipment. The memory can be used as
the storage in which to save the user program. The Flash memory to boot is fixed to 16-bit mode of external bus and
operates with a single 3.3 V power supply voltage. The write-protect of Flash memory can be enabled or disabled by
using a DIP switch.
Figure2.3.1 shows a block diagram of Flash memory.
Table2.3.2 lists bus state controller settings (write/read) for operation with the SH7206 bus clock at 66.67MHz.
Table2.3.1 Outline of the Flash Memory
Part Number Bus Size Capacity Access Time
M5M29KT331AVP 16-bit mode 4 Mbytes(16 bits × 2 Mword × 1pc.
）
70ns
SH7206
A20-A1
D15-D0
RD#
WE0#
CS0#
M5M29KT331AVP
(2 M Word x16 bit)
A19-A0
DQ15-DQ0
20
16
BYTE#
OE#
WE#
CE#
RP#
RY/BY#
WP#
3.3 V
RES#
NC
3.3 V
DIP SW
A21
A20
Figure2.3.1 Block Diagram of Flash Memory