
PM5317 SPECTRA-9953 Telecom Standard Product Data Sheet
Release
Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2000741, Issue 5
53
Pin Name
Type
Pin
No.
Function
In quad STS-48/STM-16 mode, TOHCLK1-4 is a nominal
82.94 MHz clock generated by gapping a 103.68 MHz clock.
TOHCLK1-4 has a 50% nominal high duty cycle.
TOHFP1-4 is updated on the rising edge of TOHCLK1-4.
TTOH1-4 and TTOHEN1-4 are sampled on the rising edge of
TOHCLK1-4.
TOHFP1
TOHFP2
TOHFP3
TOHFP4
Output
D14
B13
D13
B12
The
transmit overhead frame pulse
(TOHFP1-4) signal
provides timing for the transmit section, line and path
overhead insertion.
In STS-192/STM-64 mode, TOHFP1 is used to indicate the
most significant bit (MSB) on TSLD1, TLD1 and TTOH1-4.
TOHFP2-4 are not defined.
In quad STS-48/STM-16 mode, TOHFP1-4 is used to indicate
the most significant bit (MSB) on TTOH1-4.
TOHFP1 can be sampled on the rising edge of TSLDCLK and
TLDCLK. TOHFP1-4 can be sampled on the rising edge of
TOHCLK1-4
TOHFP1-4 is updated on the rising edge of TOHCLK1-4.
TTOH1
TTOH2
TTOH3
TTOH4
Input
A16
A17
C14
A15
The
transmit transport overhead
(TTOH1-4) signal contains
the transport overhead bytes (A1, A2, J0, Z0, B1, E1, F1, D1-
D3, H1-H3, B2, K1, K2, D4-D12, Z1/S1, Z2/M1, E2 and other
overhead bytes) to be transmitted and the error masks to be
applied on B1, B2, H1 and H2.
TTOH1-4 is sampled on the rising edge of TOHCLK1-4.
TTOHEN1
TTOHEN2
TTOHEN3
TTOHEN4
Input
B17
A18
D15
B16
The
transmit transport overhead insert enable
(TTOHEN1-
4) signal controls the insertion of the transmit transport
overhead data which is inserted in the outgoing stream.
When TTOHEN1-4 is high during a TOH byte on TTOH1-4,
the sampled TOH byte is inserted into the corresponding
transport overhead byte positions (A1, A2, J0, Z0, E1, F1, D1-
D3, H3, K1, K2, D4-D12, Z1/S1, Z2/M1, and E2 bytes). When
TTOHEN1-4 is low during a TOH byte on TTOH1-4, that
sampled byte is ignored and the default values are inserted
into these transport overhead bytes.
TTOHEN1-4 is sampled on the rising edge of TOHCLK1-4.