DS2155 datasheet(61/262 Pages) DALLAS

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DS2156

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9. E1 FRAMER/FORMATTER CONTROL AND STATUS REGISTERS

The E1 framer portion of the DS2156 is configured by a set of four control registers. Typically, the

control registers are only accessed when the system is first powered up. Once the DS2156 has been

initialized, the control registers need only to be accessed when there is a change in the system

configuration. There are two receive control registers (E1RCR1 and E1RCR2) and two transmit control

registers (E1TCR1 and E1TCR2). There are also four status and information registers. Each of these eight

registers is described in this section.

9.1

E1 Control Registers

E1RCR1

E1 Receive Control Register 1

33h

Bit #

Name

RSERC

RSIGM

RHDB3

RG802

RCRC4

FRC

SYNCE

RESYNC

Default

Bit 0/Resync (RESYNC). When toggled from low to high, a resync is initiated. Must be cleared and set again for a

subsequent resync.

Bit 1/Sync Enable (SYNCE)

0 = auto resync enabled

1 = auto resync disabled

Bit 2/Frame Resync Criteria (FRC)

0 = resync if FAS received in error three consecutive times

1 = resync if FAS or bit 2 of non-FAS is received in error three consecutive times

Bit 3/Receive CRC4 Enable (RCRC4)

0 = CRC4 disabled

1 = CRC4 enabled

Bit 4/Receive G.802 Enable (RG802). See Section 16 for details.

0 = do not force RCHBLK high during bit 1 of time slot 26

1 = force RCHBLK high during bit 1 of time slot 26

Bit 5/Receive HDB3 Enable (RHDB3)

0 = HDB3 disabled

1 = HDB3 enabled

Bit 6/Receive Signaling Mode Select (RSIGM)

0 = CAS signaling mode

1 = CCS signaling mode

Bit 7/RSER Control (RSERC)

0 = allow RSER to output data as received under all conditions

1 = force RSER to 1 under loss-of-frame alignment conditions

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