Rainbow Electronics DS26519 - Manual (Page 24)

DS26519 16-Port T1/E1/J1 Transceiver
24 of 310
NAME PIN TYPE FUNCTION
TCHBLK1/
TCHCLK1
A15
TCHBLK2/
TCHCLK2
A17
TCHBLK3/
TCHCLK3
N9
TCHBLK4/
TCHCLK4
V8
TCHBLK5/
TCHCLK5
V9
TCHBLK6/
TCHCLK6
W10
TCHBLK7/
TCHCLK7
E14
TCHBLK8/
TCHCLK8
H12
TCHBLK9/
TCHCLK9
N20
TCHBLK10/
TCHCLK10
W22
TCHBLK11/
TCHCLK11
Y5
TCHBLK12/
TCHCLK12
K6
TCHBLK13/
TCHCLK13
D1
TCHBLK14/
TCHCLK14
G2
TCHBLK15/
TCHCLK15
Y22
TCHBLK16/
TCHCLK16
F16
Output
Transmit Channel Block/Transmit Channel Block Clock. A dual function pin.
TCHBLK[1:16]. TCHBLKn is a user-programmable output that can be forced
high or low during any of the channels. It is synchronous with TCLKn when the
transmit-side elastic store is disabled. It is synchronous with TSYSCLKn when
the transmit-side elastic store is enabled. It is useful for blocking clocks to a serial
UART or LAPD controller in applications where not all channels are used such as
Fractional T1, Fractional E1, 384kbps (H0), 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.
TCHCLK[1:16]. TCHCLKn is a 192kHz (T1) or 256kHz (E1) clock that pulses
high during the LSB of each channel. It can also be programmed to output a
gated transmit bit clock controlled by TCHBLKn. It is synchronous with TCLKn
when the transmit-side elastic store is disabled. It is synchronous with
TSYSCLKn when the transmit-side elastic store is enabled. Useful for parallel-to-
serial conversion of channel data.