EZ-USB Datasheet, PDF (196/334 Pages) Cypress Semiconductor – The EZ-USB USB Integrated Circuit

12.2 Bulk Data Buffers
INnBUF,OUTnBUF Endpoint 0-7 IN/OUT Data Buffers
b7
b6
b5
b4
b3
b2
D7
D6
D5
D4
D3
D2
R/W
R/W
R/W
R/W
R/W
R/W
x
x
x
x
x
x
* See Table 12-1 for individual endpoint buffer addresses.
Figure 12-2. Bulk Data Buffers
1B40-1F3F*
b1
b0
D1
D0
R/W
R/W
x
x
Table 12-1. Bulk Endpoint Buffer Memory Addresses
Address
1F00-1F3F
1EC0-1EFF
1E80-1EBF
1E40-1E7F
1E00-1E3F
1DC0-1DFF
1D80-1DBF
1D40-1D7F
1D00-1D3F
1CC0-1CFF
1C80-1CBF
1C40-1C7F
1C00-1C3F
1BC0-1BFF
1B80-1BBF
1B40-1B7F
Address
7F00-7F3F
7EC0-7EFF
7E80-7EBF
7E40-7E7F
7E00-7E3F
7DC0-7DFF
7D80-7DBF
7D40-7D7F
7D00-7D3F
7CC0-7CFF
7C80-7CBF
7C40-7C7F
7C00-7C3F
7BC0-7BFF
7B80-7BBF
7B40-7B7F
Name Size
IN0BUF 64
OUT0BUF 64
IN1BUF 64
OUT1BUF 64
IN2BUF 64
OUT2BUF 64
IN3BUF 64
OUT3BUF 64
IN4BUF 64
OUT4BUF 64
IN5BUF 64
OUT5BUF 64
IN6BUF 64
OUT6BUF 64
IN7BUF 64
OUT7BUF 64
Sixteen 64-byte bulk data buffers appear at 0x1B40 and 0x7B40 in the 8K version of EZ-
USB, and only at 0x7B40 in the 32K version of EZ-USB. The endpoints are ordered to
permit the reuse of the buffer space as contiguous RAM when the higher numbered end-
points are not used. These registers default to unknown states.
EZ-USB TRM v1.9
Chapter 12. EZ-USB Registers
Page 12-3