參數(shù)資料
型號： DS3131
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： Telecom IC:Other
英文描述： SPECIALTY TELECOM CIRCUIT, PBGA256
封裝： 27 X 27 MM, PLASTIC, BGA-256
文件頁數(shù)： 23/174頁
文件大?。?/td> 1261K
代理商： DS3131
DS3131
119 of 174
- FOR DMA USE ONLY/HOST CAN ONLY READ THIS FIELD -
dword 5; Bits 16 to 31/Next Priority Pending Descriptor Pointer. This 16-bit value is the offset from the
transmit descriptor base address of the first transmit priority packet descriptor for the packet priority that is queued
up next for transmission.
Register Name:
TDMACIS
Register Description:
Transmit DMA Configuration Indirect Select
Register Address:
0870h
Bit #
7
6
5
4
3
2
1
0
Name
reserved
HCID5
HCID4
HCID3
HCID2
HCID1
HCID0
Default
0
Bit #
15
14
13
12
11
10
9
8
Name
IAB
IARW
reserved
TDCW3
TDCW2
TDCW1
TDCW0
Default
0
Note:
Bits that are underlined are read-only; all other bits are read-write.
Bits 0 to 5/HDLC Channel ID (HCID0 to HCID5)
000000 (00h) = HDLC channel number 1
100111 (27h) = HDLC channel number 40
Bits 8 to 11/Transmit DMA Configuration RAM Word Select Bits 0 to 3 (TDCW0 to TDCW3)
0000 = lower word of dword 0
0001 = upper word of dword 0
0010 = lower word of dword 1 (only word that the host can write to)
0011 = upper word of dword 1
0100 = lower word of dword 2
0101 = upper word of dword 2
0110 = lower word of dword 3
0111 = upper word of dword 3
1000 = lower word of dword 4
1001 = upper word of dword 4
1010 = lower word of dword 5
1011 = upper word of dword 5
Bit 14/Indirect Access Read/Write (IARW). When the host wishes to read data from the internal transmit DMA
configuration RAM, the host should write this bit to 1. This causes the device to begin obtaining the data from the
channel location indicated by the HCID bits. During the read access, the IAB bit is set to 1. Once the data is ready
to be read from the TDMAC register, the IAB bit is set to 0. When the host wishes to write data to the internal
transmit DMA configuration RAM, this bit should be written to 0 by the host. This causes the device to take the
data that is currently present in the TDMAC register and write it to the channel location indicated by the HCID
bits. When the device has completed the write, the IAB bit is set to 0.
Bit 15/Indirect Access Busy (IAB). When an indirect read or write access is in progress, this read-only bit is set
to 1. During a read operation, this bit is set to 1 until the data is ready to be read. It is set to 0 when the data is
ready to be read. During a write operation, this bit is set to 1 while the write is taking place. It is set to 0 once the
write operation has completed.
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