s1r72801 Epson Electronics America, Inc., s1r72801 Datasheet - Page 78

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

S1R72801F00A
ISO TxDMA Control Register
Bit7 ISO Transmit Packet Header Channel Select
Bit6..5 Reserved
Bit4 Select Transmit Pointer
Bit3 ISO FIFO Empty
Bit2 ISO FIFO Clear
Bit1 ISO Transmit Monitor
Bit0 ISO Transmit Start
74
Address Register Name
0x53
Selects the header area of an ISO Transmit packet from DMA. You can transmit a transmit packet from the
selected area. This bit selects “0”: ISOTxPktHdr0 or “1”: ISOTxPktHdr1. Since the ISOAsyncTxPktHdr0 and
ISOAsyncTxPktHdr1 areas overlap the AsyncTxPktHdr1 area, however, the firmware must decide how to use
this area.
Can switch the address pointed by the PostTxDataPtr of a transmit packet to one for Async or ISO. The
PostTxData Ptr indicates a pointer of current transmit address; “0” indicates it is for Async and “1” indicates
it is for ISO.
When the DMA-FIFO for ISO is empty, this bit becomes “0”. When it is not empty, it is “1”. This bit is read-
only and writing to this bit is ignored.
Clears the DMA-FIFO for ISO. Writing “1” to this bit clears the FIFO. After clearing it, this bit is automatically
restored to “0”.
Indicates the transmit status of ISO. “1” indicates that an ISO packet is in transmission and “0” indicates that
no ISO packet is in transmission. This bit is read-only and writing to this bit is ignored.
Transmits an ISO packet. Writing “1” to this bit starts to transmit an ISO packet. On completion of the
transmission, it is automatically restored to “0”. If you read this bit, it always indicates “0” regardless of
presence/absence of transmit.
IsoDmaCtl
7: IsoChnlSel
6:
5:
4: SelTxPtr
3: IsoFIFOEpty
2: IsoFIFOClr
1: IsoTxMon
0: IsoStart
Bit Symbol
R/W
R/W
R/W
W
W
R
R
0: IsoTxPktHdr0
0:
0:
0: Async Tx Pointer Select 1: ISO Tx Pointer Select 0x00 0x00
0: IsoFIFO Empty
0: Normal
0: Iso Tx Stop
0: normal
EPSON
Description
1: IsoTxPktHdr1
1:
1:
1: Non Empty
1: IsoFIFO Clear
1: Iso Tx Run
1: Start
H.Rst S.Rst B.Rst
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