DS31256 datasheet(12/183 Pages) MAXIM

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DS31256 256-Channel, High-Throughput HDLC Controller

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Table 2-B. Initialization Steps

INITIALIZATION STEP

COMMENTS

1) Initialize the PCI configuration registers

Achieved by asserting the PIDSEL signal.

2) Initialize all indirect registers

It is recommended that all of the indirect registers be set to

0000h (Table 2-C).

3) Configure the device for operation

Program all necessary registers, which include the Layer 1,

HDLC, FIFO, and DMA registers.

4) Enable the HDLC channels

Done through the RCHEN and TCHEN bits in the

R[n]CFG[j] and T[n]CFG[j] registers.

5) Load the DMA descriptors

Indicate to the DMA where packet data can be written and

where pending data (if any) resides.

6) Enable the DMAs

Done through the RDE and TDE control bits in the master

configuration (MC) register.

7) Enable DMA for each HDLC channel

Done through the channel-enable bit in the receive and

transmit configuration RAM.

8) Enable data transmission

Set TFDA1 bit in TPnCR registers.

Table 2-C. Indirect Registers

NAME

NUMBER OF INDIRECT REGISTERS

Channelized Port

CP0RD to CP15RD

6144 (16 Ports x 128 DS0 Channels x 3

Registers for each DS0 Channel)

Receive HDLC Channel Definition

RHCD

256 (one for each HDLC Channel)

Transmit HDLC Channel Definition

THCD

256 (one for each HDLC Channel)

Receive DMA Configuration

RDMAC

1536 (one for each HDLC Channel)

Transmit DMA Configuration

TDMAC

3072 (one for each HDLC Channel)

Receive FIFO Staring Block Pointer

RFSBP

256 (one for each HDLC Channel)

Receive FIFO Block Pointer

RFBP

1024 (one for each FIFO Block)

Receive FIFO High Watermark

RFHWM

256 (one for each HDLC Channel)

Transmit FIFO Staring Block Pointer

TFSBP

256 (one for each HDLC Channel)

Transmit FIFO Block Pointer

TFBP

1024 (one for each FIFO Block)

Transmit FIFO Low Watermark

TFLWM

256 (one for each HDLC Channel)

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