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IDT82P2288
OCTAL T1/E1/J1 LONG HAUL / SHORT HAUL TRANSCEIVER
Pin Description
17
March 04, 2009
TSCK[1] / MTSCK
TSCK[2]
TSCK[3]
TSCK[4]
TSCK[5]
TSCK[6]
TSCK[7]
TSCK[8]
Output / Input
L3
L1
K3
K1
J3
J1
H2
H4
TSCK[1:8]: Transmit Side System Clock for Link 1 ~ 8
In Transmit Clock Master mode, TSCKn outputs a (gapped) 1.544 MHz (for T1/J1 mode) / 2.048 MHz (for E1 mode)
clock used to sample the signal on the corresponding TSDn and TSIGn pins and update the signal on the corre-
sponding TSFSn pin.
In Transmit Clock Slave mode, TSCKn inputs a 1.544 MHz (for T1/J1 mode only), 2.048 MHz or 4.096 MHz clock
used to sample the signal on the corresponding TSDn, TSIGn and TSFSn pins. Selected by the TSLVCK bit (b1, T1/
J1-010H / b1, E1-010H), the TSCK[1] can be used for all eight links.
MTSCK: Multiplexed Transmit Side System Clock for Link 1 ~ 8
In Transmit Multiplexed mode, MTSCK inputs a 8.192 MHz or 16.384 MHz clock used to sample the signal on the
corresponding MTSDA/MTSDB, MTSIGA/MTSIGB and MTSFS pins.
TSCK[1:8]/MTSCK are Schmitt-triggered inputs/outputs with pull-up resistors.
Clock Generator
OSCI
Input
B13
OSCI: Crystal Oscillator Input
This pin is connected to an external clock source. In T1 mode E1 Rate of Transmit System interface, this clock must
keep the source same with system transmit clock (TSCKn/MTSCK).
The clock frequency of OSCI is defined by CLK_SEL[2:0]. The clock accuracy should be ±32 ppm and duty cycle
should be from 40% to 60%.
OSCO
Output
C13
OSCO: Crystal Oscillator Output
This pin outputs the inverted, buffered clock input from OSCI.
CLK_SEL[0]
CLK_SEL[1]
CLK_SEL[2]
Input
D15
C14
B15
CLK_SEL[2:0]: Clock Selection
These three pins select the input clock signal:
When the CLK_SEL[2] pin is low, the input clock signal is N X 1.544 MHz;
When the CLK_SEL[2] pin is high, the input clock signal is N X 2.048 MHz.
When the CLK_SEL[1:0] pins are ‘00’, the N is 1;
When the CLK_SEL[1:0] pins are ‘01’, the N is 2;
When the CLK_SEL[1:0] pins are ‘10’, the N is 3;
When the CLK_SEL[1:0] pins are ‘11’, the N is 4.
CLK_SEL[2:0] are Schmitt-trigger inputs.
CLK_GEN_1.544
Output
A16
CLK_GEN_1.544: Clock Generator 1.544 MHz Output
This pin outputs the 1.544 MHz clock signal generated by the Clock Generator.
CLK_GEN_2.048
Output
D14
CLK_GEN_2.048: Clock Generator 2.048 MHz Output
This pin outputs the 2.048 MHz clock signal generated by the Clock Generator.
REFA_OUT
Output
A15
REFA_OUT: Reference Clock Output A
The frequecy is 2.048 MHz (E1) or 1.544 MHz (T1/J1)
When no LOS is detected, this pin outputs a recovered clock from the Clock and Data Recovery function block of
one of the eight links. The link is selected by the RO1[2:0] bits (b2~0, T1/J1-007H / b2~0, E1-007H).
When LOS is detected, this pin outputs MCLK or high level, as selected by the REFH_LOS bit (b0, T1/J1-03EH,... /
b0, E1-03EH,...). *
Note: MCLK is a clock derived from OSCI using an internal PLL, and the frequency is 2.048 MHz (E1) or 1.544 MHz
(T1/J1).
REFB_OUT
Output
B14
REFB_OUT: Reference Clock Output B
The frequecy is 2.048 MHz (E1) or 1.544 MHz (T1/J1)
When no LOS is detected, this pin outputs a recovered clock from the Clock and Data Recovery function block of
one of the eight links. The link is selected by the RO2[2:0] bits (b5~3, T1/J1-007H / b5~3, E1-007H).
When LOS is detected, this pin outputs MCLK or high level, as selected by the REFH_LOS bit (b0, T1/J1-03EH,... /
b0, E1-03EH,...). *
Name
Type
Pin No.
Description
Note:
* This feature is available in ZB revision only.