s1r72801 Epson Electronics America, Inc., s1r72801 Datasheet - Page 72

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

S1R72801F00A
Receive Stream Data LINK Pointer Register
Transmit Stream Data LINK Pointer Register
68
Address
Address
0x44
0x45
0x46
0x47
This Receive Stream Data LINK Pointer Register indicates the starting address of the latest received stream data
in the RxStreamdataArea. 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.)
This Transmit Stream Data LINK Pointer Register indicates the starting address of unused area in the
RxStreamArea. 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. This register is read-only. Writing is ignored.
LinkRxStreamPtr_H 7:
LinkRxStreamPtr_L 7: PSP[7]
LinkTxStreamPtr_H 7:
LinkTxStreamPtr_L
Register Name
Register Name
Bit Symbol R/W
Bit Symbol R/W
6:
5:
4: PSP[12]
3: PSP[11]
2: PSP[10]
1: PSP[9]
0: PSP[8]
6: PSP[6]
5: PSP[5]
4: PSP[4]
3: PSP[3]
2: PSP[2]
1:
0:
6:
5:
4: PTDP[12]
3: PTDP[11]
2: PTDP[10]
1: PTDP[9]
0: PTDP[8]
7: PTDP[7]
6: PTDP[6]
5: PTDP[5]
4: PTDP[4]
3: PTDP[3]
2: PTDP[2]
1:
0:
R/W
R
Write is ignore
Write is ignore
Read is always zero
Current Received Packet Stream Data Area Pointer
Write is ignore
Read is always zero
Read is always zero
Current Transmit Packet Data Area Pointer
Write is ignore
Read is always zero
EPSON
Description
Description
H.Rst S.Rst B.Rst
H.Rst S.Rst B.Rst
0x00 0x00
0x00 0x00
0x00 0x00
0x00 0x00
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–