
RELEASED
DATA SHEET
PM7366 FREEDM-8
ISSUE 4
PMC-1970930
FRAME ENGINE AND DATA LINK MANAGER
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA,INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
11
8
PIN DESCRIPTION
Table 1 – Line Side Interface Signals (36)
Pin No.
Pin Name
Type
-PI
-BI
Function
RCLK[0]
RCLK[1]
RCLK[2]
RCLK[3]
RCLK[4]
RCLK[5]
RCLK[6]
RCLK[7]
Input
G1
G3
F2
F3
E2
D1
D2
B4
H17
F20
F18
E19
E18
D19
D18
D16
The receive line clock signals (RCLK[7:0]) contain the
recovered line clock for the 8 independently timed
links. Processing of the receive links is on a priority
basis, in descending order from RCLK[0] to RCLK[7].
Therefore, the highest rate link should be connected
to RCLK[0] and the lowest to RCLK[7]. RD[7:0] is
sampled on the rising edge of the corresponding
RCLK[7:0] clock.
For channelised T1 or E1 links, RCLK[n] must be
gapped during the framing bit (for T1 interfaces) or
during time-slot 0 (for E1 interfaces) of the RD[n]
stream. The FREEDM-8 uses the gapping
information to determine the time-slot alignment in
the receive stream. RCLK[7:0] is nominally a 50%
duty cycle clock of 1.544 MHz for T1 links and 2.048
MHz for E1 links.
For unchannelised links, RCLK[n] must be externally
gapped during the bits or time-slots that are not part
of the transmission format payload (i.e. not part of the
HDLC packet). RCLK[2:0] is nominally a 50% duty
cycle clock between 0 and 52 MHz. RCLK[7:3] is
nominally a 50% duty cycle clock between 0 and 10
MHz.