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DS26503数据手册封面

DS26503 Datasheet

  • DS26503

  • T1/E1/J1 BITS单元

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DS26504 T1/E1/J1/64KCC BITS Element
NAME
TYPE
A4/CPHA/
L2
I
FUNCTION
Address Bus Bit A[4]/Serial Port Clock Phase Select/Line Build-Out
Select 2
A4:
In nonmultiplexed bus operation (BIS[1:0] = 01), this pin serves as A[4]. In
multiplexed bus operation (BIS[1:0] = 00), these pins are not used and should
be tied low.
CPHA:
In Serial Port Mode (BIS[1:0] = 10), this pin selects the serial port
clock phase. See the functional timing diagrams for the Serial Port Interface.
L2:
In Hardware Mode (BIS[1:0] = 11), this pin selects the line build-out value.
Address Bus Bit A[3]/Line Build-Out Select 1
A3:
In nonmultiplexed bus operation (BIS[1:0] = 01), this pin serves as A[3]. In
multiplexed bus operation (BIS[1:0] = 00), these pins are not used and should
be tied low.
L1:
In Hardware Mode (BIS[1:0] = 11), this pin selects the line build-out value.
Address Bus Bit A[2]/Line Build-Out Select 0
A2:
In nonmultiplexed bus operation (BIS[1:0] = 01), this pin serves as A[2]. In
multiplexed bus operation (BIS[1:0] = 00), these pins are not used and should
be tied low.
L0:
In Hardware Mode (BIS[1:0] = 11), this pin selects the line build-out value.
Address Bus Bit A[1]/Transmit AIS
A1:
In nonmultiplexed bus operation (BIS[1:0] = 01), this pin serves as A[1]. In
multiplexed bus operation (BIS[1:0] = 00), these pins are not used and should
be tied low.
A3/
L1
I
A2/
L0
I
A1/
TAIS
I
TAIS:
When set to 1 and in T1/E1 operating modes, the transmitter transmits an
AIS pattern.
TAIS (64KCC):
When set = 0 and in any 64KCC mode, the device transmits an
all-ones signal without BPVs. When set = 1, normal 64KCC transmission is
enabled.
Address Bus Bit A[0]/E1 Termination Select
A0:
In nonmultiplexed bus operation (BIS[1:0] = 01), this pin serves as A[0]. In
multiplexed bus operation (BIS[1:0] = 00), these pins are not used and should
be tied low.
E1TS:
In Hardware Mode (BIS[1:0] = 11), this pin selects the E1 internal
termination value (0 = 120W, 1 = 75W).
Bus Type Select/Transmit and Receive B8ZS/HDB3 Enable
BTS:
Strap high to select Motorola bus timing; strap low to select Intel bus
timing. This pin controls the function of the
RD
(DS), ALE (AS), and
WR
(R/W) pins. If BTS = 1, then these pins assume the function listed in
parentheses ().
HBE:
In Hardware Mode (BIS[1:0] = 11), this pin enables transmit and receive
B8ZS/HDB3 when in T1/E1 operating modes.
A0/
E1TS
I
BTS/
HBE
I
19 of 128

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