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Chapter 15. Registers Page 15-61
15.9 UDMA CRC Registers
For complete Flowstate / UDMA information, please contact the Cypress Semiconductor Applica-
tions Department.
These two registers are strictly for debug purposes. The CRC represented by these registers is
calculated based on the rules defined in the ATAPI specification for UDMA transfers. It is calcu-
lated automatically by the GPIF as data is transferred on FD[15:0].
These registers will return the live calculation of the CRC at any point in the transfer, but will be
reset to the seed value of 0x4ABA upon the GPIF entering the IDLE state. These registers are writ-
able; thus the currently calculated CRC including the seed value can be overwritten at any time.
UDMACRCH
see Section 15.14
E67D
b7 b6 b5 b4 b3 b2 b1 b0
CRC[15:8]
RW RW RW RW RW RW RW RW
0 1 0 0 1 0 1 0
UDMACRCL
see Section 15.14
E67E
b7 b6 b5 b4 b3 b2 b1 b0
CRC[7:0]
RW RW RW RW RW RW RW RW
1 0 1 1 1 0 1 0
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