PM5366-PI PMC-Sierra, Inc., PM5366-PI Datasheet - Page 173
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PM5366-PI
Manufacturer Part Number
PM5366-PI
Description
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER AND M13 MULTIPLEXER
Manufacturer
PMC-Sierra, Inc.
Datasheet
1.PM5366-PI.pdf
(267 pages)
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PRELIMINARY
DATASHEET
PMC-2010672
PROPRIETARY AND CONFIDENTIAL
accessed (with respect to WRB rising edge and RDB falling edge) at a rate no
faster than 1/8 that of the DS3 or E3 clock. This time is used by the high-speed
system clock to sample the event, write the FIFO, and update the FIFO status.
Instantaneous variations in the high-speed reference clock frequencies (e.g. jitter
in the line clock) must be considered when determining the procedure used to
read and write the TDPR registers.
Upon reset of the TEMAP-84, the TDPR should be disabled by setting the EN bit
in the TDPR Configuration Register to logic 0 (default value). An HDLC all-ones
Idle signal will be sent while in this state. The TDPR is enabled by setting the EN
bit to logic 1. The FIFOCLR bit should be set and then cleared to initialize the
TDPR FIFO. The TDPR is now ready to transmit.
To initialize the TDPR, the TDPR Configuration Register must be properly set. If
FCS generation is desired, the CRC bit should be set to logic 1. If the block is to
be used in interrupt driven mode, then interrupts should be enabled by setting
the FULLE, OVRE, UDRE, and LFILLE bits in the TDPR Interrupt Enable register
to logic 1. The TDPR operating parameters in the TDPR Upper Transmit
Threshold and TDPR Lower Interrupt Threshold registers should be set to the
desired values. The TDPR Upper Transmit Threshold sets the value at which the
TDPR automatically begins the transmission of HDLC packets, even if no
complete packets are in the FIFO. Transmission will continue until the current
packet is transmitted and the number of bytes in the TDPR FIFO falls to, or
below, this threshold level. The TDPR will always transmit all complete HDLC
packets (packets with EOM attached) in its FIFO. Finally, the TDPR can be
enabled by setting the EN bit to logic 1. If no message is sent after the EN bit is
set to logic 1, continuous flags will be sent.
The TDPR can be used in a polled or interrupt driven mode for the transfer of
data. In the polled mode the processor controlling the TDPR must periodically
read the TDPR Interrupt Status register to determine when to write to the TDPR
Transmit Data register. In the interrupt driven mode, the processor controlling
the TDPR uses the INTB output, the one of the TEMAP-84 Master Interrupt
Source registers, and the TEMAP-84 TDPR Interrupt Status registers to identify
TDPR interrupts which determine when writes can or must be done to the TDPR
Transmit Data register.
Interrupt Driven Mode:
The TDPR automatically transmits a packet once it is completely written into the
TDPR FIFO. The TDPR also begins transmission of bytes once the FIFO level
exceeds the programmable Upper Transmit Threshold. The CRC bit can be set
to logic 1 so that the FCS is generated and inserted at the end of a packet. The
TDPR Lower Interrupt Threshold should be set to such a value that sufficient
ISSUE 1
161
HIGH DENSITY 84/63 CHANNEL VT/TU MAPPER
AND M13 MULTIPLEXER
PM5366 TEMAP-84
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