Cirrus-logic EP93xx Uživatelský manuál Strana 789

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DS785UM1 27-19
Copyright 2007 Cirrus Logic
IDE Interface
EP93xx User’s Guide
2
7
2
7
Bit Descriptions:
RSVD: Reserved. Unknown during read, ignored during writes.
HPTR: Head pointer in the write buffer.
TPTR: Tail pointer in the write buffer.
EMPTY: Write buffer empty status.
HOM: Half or more entries in write buffer filled status.
NFULL: Write buffer near full status.
FULL: Write buffer full status.
CRC: CRC result for data-out operation. Reset to 0x4ABA after
finishing UDMA operation.
IDEUDMARdBufSts
Address:
0x800A_0034 - Read Only
Default:
0000_0100
Definition:
Status register for UDMA read buffer.
Bit Descriptions:
RSVD: Reserved. Unknown during read, ignored during writes.
HPTR: Head pointer in the read buffer.
TPTR: Tail pointer in the read buffer.
EMPTY: Read buffer empty status.
HOM: Half or more entries in read buffer filled status.
NFULL: Read buffer near full status.
FULL: Read buffer full status.
CRC: CRC result for data-in operation. Reset back to 0x4ABA
after finishing UDMA operation.
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
CRC
1514131211109876543210
RSVD FULL NFULL HOM EMPTY TPTR HPTR
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