s1r72801 Epson Electronics America, Inc., s1r72801 Datasheet - Page 71

• Manufacturer Part Number: s1r72801
• Description: Ieee1394 Controller S1r72801f00a
• Manufacturer: Epson Electronics America, Inc.

Receive Header LINK Pointer Register
Receive ORB Data LINK Pointer Register
Address
Address Register Name
0x42
0x43
0x40
0x41
This Receive Header LINK Pointer Register indicates the starting address of the latest receive packet in the
RxHeaderArea. Since the buffer pointer is given in 8Quadlet unit, the lower order 5 bits are always “0”. Also,
since the buffer size is 2 Kbytes, the higher order 3 bits are always “0”.
Reading the higher order bytes holds the lower order bytes. When writing to this register, write the higher order
bytes-lower order bytes in order. (With timing of writing to the lower order bytes, the register is updated.)
This Receive ORB Data LINK Pointer Register indicates the starting address of the latest receive ORB data in the
RxORBdataArea. Since the buffer pointer is in Quadlet unit, the lower order 2 bits are always “0”. Also, since the
buffer size is 2 Kbytes, the higher order 3 bits are always “0”.
Reading the higher order bytes holds the lower order bytes. When writing to this register, write the higher order
bytes and lower order bytes in order. (With timing of writing to the lower order bytes, the register is updated.)
LinkRxORBPtr_H
LinkRxORBPtr_L
LinkRxHdrPtr_H 7:
LinkRxHdrPtr_L 7: LRHP[7]
UltraDmaMode
Register Name
6:
5:
4: LRHP[12]
3: LRHP[11]
2: LRHP[10]
1: LRHP[9]
0: LRHP[8]
6: LRHP[6]
5: LRHP[5]
4:
3:
2:
1:
0:
Bit Symbol
7:
6:
5:
4: POP[12]
3: POP[11]
2: POP[10]
1: POP[9]
0: POP[8]
7: POP[7]
6: POP[6]
5: POP[5]
4: POP[4]
3: POP[3]
2: POP[2]
1:
0:
Bit Symbol R/W
R/W
R/W
R/W
Write is ignore
Read is always zero
Current Received Packet ORB Data Area Pointer
Write is ignore
Read is always zero
Write is ignore
Read is always zero
Current Received Packet Header Area Pointer
Write is ignore
Read is always zero
EPSON
Description
Description
S1R72801F00A
H.Rst S.Rst B.Rst
H.Rst S.Rst B.Rst
0x00 0x00
0x00 0x00
0x00 0x00
0x00 0x00
–
–
–
–
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