Static memory controller, 1 introduction, Chapter 12. static memory controller -1 – Cirrus Logic EP93xx User Manual
Page 479: 1 introduction -1
DS785UM1
12-1
Copyright 2007 Cirrus Logic
1
2
1
2
12
Chapter 12
12
Static Memory Controller
12.1 Introduction
Note: In the EP9301 and 9302 processors, the common address/data bus is 16-bits wide
and the Static Memory Controller (SMC) supports 8-bit and 16-bit devices.
Note: In the EP9307, EP9312, and EP9315 processors, the common address/data bus is
programmable to either 16-bits or 32-bits wide, and the SMC supports 8-bit, 16-bit,
and 32-bit devices.
Note: PCMCIA (PC Card) is supported in the EP9315 processor only.
The Static Memory Controller (SMC) operates in little endian mode, and it supports up to six
independently configurable memory spaces or banks. Supported memory types are:
•
SRAM
•
ROM
•
NOR FLASH
•
External Peripheral that has an SRAM-type interface
Each memory bank can be configured to support:
•
Memory devices that have either 8-, 16-, or 32-bit data paths. For example:
• Two 16-bit devices can be used in parallel to make a 32-bit data path
• Two 8-bit devices can be used in parallel to make a 16-bit data path
• One 16-bit device can be used standalone to make an 16-bit data path
• One 8-bit device can be used standalone to make an 8-bit data path
•
One external peripheral that uses the external DMA handshake signals, DREQ0/1,
DACK0/1, and optionally DEOT0/1. These signals are multiplexed with EPGIO[12:7]
pins.
Note: There are only two external DMA interfaces total on the EP93xx device to control data flow
•
Non-burst read and write accesses
•
Page Mode (burst-of-four) read and write accesses
•
PCMCIA interfacing (EP9315 processor only)