EZ-USB Datasheet, PDF (241/334 Pages) Cypress Semiconductor – The EZ-USB USB Integrated Circuit

AUTOPTRH
Auto Pointer Address High
7FE3
b7
b6
b5
b4
b3
b2
b1
b0
A15
A14
A13
A12
A11
A10
A9
A8
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
x
x
x
x
x
x
x
x
AUTOPTRL
Auto Pointer Address Low
7FE4
b7
b6
b5
b4
b3
b2
b1
b0
A7
A6
A5
A4
A3
A2
A1
A0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
x
x
x
x
x
x
x
x
AUTODATA
Auto Pointer Data
7FE5
b7
b6
b5
b4
b3
b2
b1
b0
D7
D6
D5
D4
D3
D2
D1
D0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
x
x
x
x
x
x
x
x
Figure 12-39. Auto Pointer Registers
These registers implement the EZ-USB Autopointer.
AUTOPTRH/L
The 8051 loads a 16-bit address into the AUTOPTRH/L registers. Subsequent reads or
writes to the AUTODATA register increment the 16-bit value in these registers. The
loaded address must be in internal EZ-USB RAM. The 8051 can read these registers to
determine the address must be in internal EZ-USB RAM. The 8051 can read these regis-
ters to determine the address of the next byte to be accessed via the AUTODATA register.
AUTODATA
8051 data read or written to the AUTODATA register accesses the memory addressed by
the AUTOPTRH/L registers, and increments the address after the read or write.
These registers allow FIFO access to the bulk endpoint buffers, as well as being useful for
internal data movement. Chapter 6, "EZ-USB Bulk Transfers" and Chapter 8, "EZ-USB
Isochronous Transfers" explain how to use the Autopointer for fast transfers to and from
the EZ-USB endpoint buffers.
Page 12-48
Chapter 12. EZ-USB Registers
EZ-USB TRM v1.9