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Overview

The Digilent Memory Module 1 circuit board

(the MEM1) is a byte wide memory board

containing static RAM memory and flash ROM

memory. It can be attached to a Digilent

system board to provide memory for use in

logic designs implemented on the system

board:

The MEM1 circuit board is available in various

memory configurations:

• C1: 512Kb SRAM, 512Kb Flash

• C2: 1Mb SRAM, no Flash

• C3: no SRAM, 1Mb Flash

Functional Description

The following is a brief description of the

operation of the memory devices on the MEM1

board. For complete documentation on the

operation of the various memory devices, refer

to the respective manufacturers data sheets.

The MEM1 board contains two memory banks,

Bank 0 and Bank 1. Bank 0 can be loaded with

either an ISSI IS63LV1024L-J 128K x 8 SRAM

or an ISSI IS61LV5128T 512K x 8 SRAM. Chip

select line CS0 enables the memory device

installed on Bank 0 for access.

Memory Bank 1 can be loaded with either an

ISSI IS61LV5128T 512K x 8 SRAM, a Micron

MT28F004B3 512K x 8 Flash ROM, or a

Micron MT28F008B3 1M x 8 Flash ROM. Chip

select line CS1 enables the memory device

installed on Bank 1 for access.

Configuration C1 has the IS61LV5128T

installed in Bank 0 and the MT28F004B3

installed in Bank 1.

Configuration C2 has the IS61LV5128T

installed in both Bank 0 and Bank 1.

Configuration C3 has the MT28F008B3 installed

in Bank1. Chip select line CS0 is used for the

highest-order address bit.

The MEM1 has 19 address inputs (A0-A18), 8 bi-

directional data input/outputs (D0-D7), two

chip/bank select inputs (CS0 and CS1), a single

read strobe input (OE) and a single write strobe

input (WE). Note: for the 128K IS64LV1024L-J

device, only address lines A0-A16 are used.

A memory read cycle is performed by placing the

address on the address lines, bringing the

appropriate chip select line low to enable the

memory device, bringing the OE line low and

then reading the data placed on the bi-directional

data lines by the selected memory device.

Connector J1

512K

RAM

128K

RAM

512K

RAM

512K

FLASH

Bank 0

Bank 1

OROR

MEM1 Circuit Diagram

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Digilent Memory Module 1 Bedienungsanleitung

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