EZ-USB Datasheet, PDF (85/334 Pages) Cypress Semiconductor – The EZ-USB USB Integrated Circuit

5.8 Serial EEPROM Present, First Byte is 0xB2
If, at power-on, the EZ-USB core detects an EEPROM connected to its I²C port with the
value 0xB2 at address 0; the EZ-USB core loads the EEPROM data into EZ-USB RAM.
It also sets the ReNum bit to 1, causing device requests to be fielded by the 8051 instead of
the EZ-USB core. The EEPROM data format is shown in Table 5-8.
Table 5-8. EEPROM Data Format for “B2” Load
EEPROM
Address
Contents
0
0xB2
1
Vendor ID (VID) L
2
Vendor ID (VID) H
3
Product ID (PID) L
4
Product ID (PID) H
5
Device ID (DID) L
6
Device ID (DID) H
7
Length H
8
Length L
9
StartAddr H
10
StartAddr L
---
Data block
---
---
Length H
---
Length L
---
StartAddr H
---
StartAddr L
---
Data block
---
---
0x80
---
0x01
---
0x7F
---
0x92
---
Last
00000000
The first byte tells the EZ-USB core to copy EEPROM data into RAM. The next six bytes
(1-6) are ignored (see the text box, “VID/PID/DID in a “B2” EEPROM” on page 5-11).
Page 5-10
Chapter 5. EZ-USB CPU
EZ-USB TRM v1.9