Rainbow Electronics DS26519 User Manual
Page 28
DS26519 16-Port T1/E1/J1 Transceiver
28 of 310
NAME PIN
TYPE
FUNCTION
RCHBLK1/
RCHCLK1
F3
RCHBLK2/
RCHCLK2
G8
RCHBLK3/
RCHCLK3
H5
RCHBLK4/
RCHCLK4
Y7
RCHBLK5/
RCHCLK5
AA8
RCHBLK6/
RCHCLK6
AA11
RCHBLK7/
RCHCLK7
E18
RCHBLK8/
RCHCLK8
U20
RCHBLK9/
RCHCLK9
G7
RCHBLK10/
RCHCLK10
L15
RCHBLK11/
RCHCLK11
B2
RCHBLK12/
RCHCLK12
W4
RCHBLK13/
RCHCLK13
M6
RCHBLK14/
RCHCLK14
U17
RCHBLK15/
RCHCLK15
H14
RCHBLK16/
RCHCLK16
R16
Output
Receive Channel Block/Receive Channel Block Clock.
This pin can be
configured to output either RCHBLK or RCHCLK.
RCHBLK[1:16].
RCHBLKn is a user-programmable output that can be forced
high or low during any of the 24 T1 or 32 E1 channels. It is synchronous with
RCLKn when the receive-side elastic store is disabled. It is synchronous with
RSYSCLKn when the receive-side elastic store is enabled. This pin is useful for
blocking clocks to a serial UART or LAPD controller in applications where not all
channels are used such as fractional service, 384kbps service, 768kbps, or
ISDN-PRI. Also useful for locating individual channels in drop-and-insert
applications, for external per-channel loopback, and for per-channel conditioning.
RCHCLK[1:16].
RCHCLKn is a 192kHz (T1) or 256kHz (E1) clock that pulses
high during the LSB of each channel. It is synchronous with RCLKn when the
receive-side elastic store is disabled. It is synchronous with RSYSCLKn when the
receive-side elastic store is enabled. It is useful for parallel-to-serial conversion of
channel data.
BPCLK1 H8
BPCLK2 R17
Output
Backplane Clock [1:2].
Programmable clock outputs that can be set to
2.048MHz, 4.096MHz, 8.192MHz, or 16.384MHz. The reference to these clocks
can be RCLK[8:1] for BPCLK1 and RCLK[9:16] for BPCLK2, a 1.544MHz or
2.048MHz clock frequency derived from MCLK, or an external reference clock
(REFCLKIO). This allows system clocks to be referenced from external sources,
the T1J1E1 recovered clocks, or the MCLK oscillator.
CLKO C3
Output
Clock Out.
Clock output pin that can be programmed to output numerous
frequencies referenced to MCLK. Frequencies available: 1.544MHz, 2.048MHz,
4.096MHz, 8.192MHz, 12.288MHz, 16.384MHz, 256kHz, and 64kHz.
.CLKOSEL[3:0] selects the frequency.