89HPEB383 Datasheet, PDF (115/264 Pages) Integrated Device Technology – Topics discussed include the following

101
12.
Serial EEPROM
Topics discussed include the following:
• “Overview”
• “System Diagram”
• “EEPROM Image”
• “Functional Timing”
12.1
Overview
The PEB383 uses an internal serial EEPROM Controller to configure its configuration space register
(CSR) block with the values stored in an external serial EEPROM. The Controller is compatible with
EEPROM devices that use the Serial Peripheral Interface, such as the Atmel AT25010A, AT25020A,
AT25040A, AT25080A, AT25160A, AT25320A, and AT25640A.
The primary purpose of the EEPROM Controller is to modify some of the default values of the
Read-only and Read/Write registers in the PEB383’s CSR space (for more information, see “Register
Descriptions”). After reset is de-asserted, the Controller initiates the read instructions to the external
EEPROM and reads its contents. If an EEPROM is present the Controller writes its data into the
PEB383’s register space depending on the offset address provided in the EEPROM location.
The EEPROM Controller can write data into an external EEPROM using the “EEPROM Control
Register”. It supports 9-bit and 16-bit addressing modes to read and write the external EEPROM.
Integrated Device Technology, Inc.
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PEB383 User Manual
July 25, 2011