PM8313 datasheet(75/192 Pages) PMC

75 / 192 page

PM8313 D3MX

DATA SHEET

PMC-920702

ISSUE 5

M13 MULTIPLEXER

RNR:

The Receive Network Requirement (RNR) bit reflects the real time value of

the Network Requirement (Nr) bit presented in the second C-bit in M-

subframe 1 when in DS3 C-bit parity mode. The RNR bit is a logic 1 if a logic

one occurs in the Nr overhead bit timeslot. If C-bit parity is not selected, the

value of RNR is meaningless and random.

TNR:

The Transmit Network Requirement (TNR) bit determines the value inserted

into the Network Requirement (Nr) bit transmitted in the second C-bit in M-

subframe 1 when in DS3 C-bit parity mode. A logic 1 in the TNR bit causes a

one to be transmitted in the Nr overhead bit timeslot. The TNR bit is set to a

logic 1 upon either a hardware or software reset. If C-bit parity is not

selected, the TNR bit has no effect. Note that the serial control input, TOHEN,

takes precedence over the effect of this bit when TOHEN is asserted during

the Network Requirement Bit position. While TOHEN is asserted at the

second C-bit position of M-subframe 1, the data on the TOH input is

transmitted in the Nr bit.

When the device is set for transmission of AIS (Register 0CH Bit 6) in C-bit parity

mode, all C-bits are forced to 0 except for the network requirement bit which is

forced to the TNR register bit value. The TNR bit must be cleared when TRAN is

enabled to generate AIS in C-bit parity mode.

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