DS31256 datasheet(51/183 Pages) MAXIM

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DS31256 256-Channel, High-Throughput HDLC Controller

51 of 183

Bit 14/Interrupt Enable for TCOFA (IETC)

0 = interrupt masked

1 = interrupt enabled

Bit 15/COFA Status Bit (TCOFA). This latched read-only status bit is set if a COFA is detected. A COFA is

detected by sensing that a sync pulse has occurred during a clock period that was not the first bit of the

193/256/512/1024-bit frame. This bit is reset when read and is not set again until another COFA has occurred.

6.3 Layer 1 Configuration Register Description

There are three configuration registers for each DS0 channel on each port (Figure 6-3). As shown in

Figure 6-1, each of the 16 ports contains a PORT RAM, which controls the Layer 1 state machine. These

384 registers (three registers x 128 DS0 channels per port) comprise the PORT RAM for each port,

controlling and providing access to the Layer 1 state machine. The registers are accessed indirectly

through the channelized port register data (CP[n]RD) register. The host must first write to the

channelized port register data-indirect select (CP[n]RDIS) register to choose which DS0 channel and

channelized PORT RAM it wishes to configure or read. On power-up, the host must write to all the used

R[n]CFG[j] and T[n]CFG[j] locations to make sure they are set into a known state.

Figure 6-3. Layer 1 Register Set

C[n]DAT[j]: Channelized DS0 Data

LSB

RDATA(8): Receive DS0 Data

MSB

TDATA(8): Transmit DS0 Data

R[n]CFG[j]: Receive Configuration

LSB

RCH#(8): Receive HDLC Channel Number

MSB

RCHEN

RBERT

n/a

RV54

n/a

CLLB

n/a

R56

T[n]CFG[j]: Transmit Configuration

LSB

TCH#(8): Transmit HDLC Channel Number

MSB

TCHEN

TBERT

n/a

CNLB

n/a

TFAO

T56

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