Rainbow Electronics DS26504 - Manual (Page 19)

DS26504 T1/E1/J1/64KCC BITS Element
19 of 128
NAME TYPE FUNCTION
A4/CPHA/
L2
I
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.
A3/
L1
I
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.
A2/
L0
I
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.
A1/
TAIS I
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.
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.
A0/
E1TS
I
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 = 120
W, 1 = 75W).
BTS/
HBE
I
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.