Datasheet

DS26502 T1/E1/J1/64KCC BITS Element
20 of 125
NAME TYPE FUNCTION
RD(DS)/
RMODE2
I
Read Input-Data Strobe/Receive Mode Select Bit 2
RD ( DS ): These pins are active-low signals. DS is active high when BIS[1:0]
= 01. See the bus timing diagrams.
RMODE2: In Hardware Mode (BIS[1:0] = 11), this pin selects the receive
side operating mode.
CS/RLB
I
Chip Select/Remote Loopback Enable
CS : This active-low signal must be low to read or write to the device. This
signal is used for both the parallel port and the serial port modes.
RLB: In Hardware Mode (BIS[1:0] = 11), when high, remote loopback is
enabled. This function is only valid when the transmit side and receive side
are in the same operating mode.
ALE (AS)/
A7/MPS1
I
Address Latch Enable (Address Strobe)/Address Bus Bit 7/MCLK
Prescale Select 1
ALE (AS): In multiplexed bus operation (BIS[1:0] = 00), it serves to
demultiplex the bus on a positive-going edge.
A7: In nonmultiplexed bus operation (BIS[1:0] = 01), this pin serves as A[7].
MPS1: In Hardware Mode (BIS[1:0] = 11), MCLK prescale select, used to set
the prescale value for the PLL.
WR (R/W)/
TMODE3
I
Write Input (Read/Write)/Transmit Mode Select 3
WR : In Processor Mode, this pin is the active-low write signal.
TMODE3: In Hardware Mode, this pin selects the transmit-side operating
mode.