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): 35/174頁
文件大?。?/td> 1261K
代理商: DS3131
DS3131
13 of 174
Table 2-B. Initialization Steps
INITIALIZATION STEP
COMMENTS
1) System Reset
System reset can be invoked by either hardware action
through the PRST signal (recommended) or software
action through the RST control bit in the master reset and
ID register. All configuration registers are set to 0 (0000h)
by system reset.
2) Configure LBBMC Register
Please note that this register is not affected by the
software-invoked system reset. It is forced to all zeros only
by the hardware reset.
3) Configure PCI
This is achieved by asserting the PIDSEL signal.
4) Disable Transmit and Receive DMA for each
Channel
Ensure the DMA is off on both the transmit and receive
sides through the channel-enable bit in the transmit and
receive RAM.
5) Configure Receive DMA
Program the receive DMA configuration RAM.
6) Configure Receive FIFO
Program the receive FIFO registers.
7) Configure Receive Layer 1
Program the receive port registers (RP[n]CR).
8) Configure Transmit DMA
Program the transmit DMA configuration RAM.
9) Configure Transmit FIFO
Program the transmit FIFO registers.
10) Configure Transmit Layer 2
Program the transmit HDLC port control registers
(TH[n]CR).
11) Configure Transmit Layer 1
Program the transmit port registers (TP[n]CR).
12) Configure Receive Layer 2
Program the receive HDLC port control registers
(RH[n]CR).
13) Enable Receive DMA for Each Channel
Set the channel-enable bit in the receive DMA
configuration RAM for the channels in use.
14) Enable Transmit DMA for Each Channel
Set the channel-enable bit in the transmit DMA
configuration RAM for the channels in use.
15) Configure Interrupts
Optional,
16) Configure Master Control Register
Set the RDE and TDE control bits in the master
configuration (MC) register.
Table 2-C. Indirect Registers
REGISTER
NAME
NUMBER OF INDIRECT REGISTERS
Receive DMA Configuration
RDMAC
120 (three for each HDLC Channel)
1
Transmit DMA Configuration
TDMAC
240 (six for each HDLC Channel)
1
Receive FIFO Starting Block Pointer
RFSBP
40 (one for each HDLC Channel)
Receive FIFO Block Pointer
RFBP
512 (one for each FIFO Block)
Receive FIFO High Watermark
RFHWM
40 (one for each HDLC Channel)
Transmit FIFO Starting Block Pointer
TFSBP
40 (one for each HDLC Channel)
Transmit FIFO Block Pointer
TFBP
512 (one for each FIFO Block)
Transmit FIFO Low Watermark
TFLWM
40 (one for each HDLC Channel)
1 On device initialization, the host needs only to write to one of the receive and one of the transmit DMA registers. See Sections 9.2.5 and 9.3.5
for details.
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