Rainbow Electronics DS26503 - Manual (Page 17)

DS26503 T1/E1/J1 BITS Element
17 of 123
4.4 Controller Interface
NAME TYPE FUNCTION
INT/
JACKS
I/O
Interrupt/JA Clock Source Select 1
INT: Flags host controller during events, alarms, and conditions defined in
the status registers. Active-low open-drain output.
JACKS: Hardware Mode: JA Clock Select. Set this pin high for T1 mode
operation when either a 2.048MHz, 4.096MHz, 8.192MHz or 16.382MHz
signal is applied at MCLK.
TMODE1 I
Transmit Mode Select 1. In Hardware Mode (BIS[1:0] = 11), this bit is used
to configure the transmit operating mode.
TMODE2 I
Transmit Mode Select 2. In Hardware Mode (BIS[1:0] = 11), this bit is used
to configure the transmit operating mode.
TSTRST I
Tri-State Control and Device Reset. A dual-function pin. A zero-to-one
transition issues a hardware reset to the DS26503 register set. Configuration
register contents are set to the default state. Leaving TSTRST high tri-states
all output and I/O pins (including the parallel control port). Set low for
normal operation. Useful for in-board level testing.
BIS[1:0] I
Processor Interface Mode Select 1, 0. These bits select the processor
interface mode of operation.
BIS[1:0] : 00 = Parallel Port Mode (Multiplexed)
01 = Parallel Port Mode (Nonmultiplexed)
10 = Serial Port Mode
11 = Hardware Mode
AD[7]/
RITD
I/O
Data Bus D[7] or Address/Data Bus AD[7]/Transmit Termination Select
A[7]: In nonmultiplexed bus operation (BIS[1:0] = 01), it serves as the data
bus D[7].
AD[7]: In multiplexed bus operation (BIS[1:0] = 00), it serves as the
multiplexed address/data bus AD[7].
RITD: In Hardware Mode (BIS[1:0] = 11), it disables the internal receive
termination.
AD[6]/
TITD
I/O
Data Bus D[6] or Address/Data Bus AD[6]/Transmit Termination Select
A[6]: In nonmultiplexed bus operation (BIS[1:0] = 01), it serves as the data
bus D[6].
AD[6]: In multiplexed bus operation (BIS[1:0] = 00), it serves as the
multiplexed address/data bus AD[6].
TITD: In Hardware Mode (BIS[1:0] = 11), it disables the internal transmit
termination.
AD[5]/
RMODE1
I/O
Data Bus D[5] or Address/Data Bus AD[5]/Receive Framing Mode Select
Bit 1
A[5]: In nonmultiplexed bus operation (BIS[1:0] = 01), it serves as the data
bus D[5].
AD[5]: In multiplexed bus operation (BIS[1:0] = 00), it serves as the
multiplexed address/data bus AD[5].
RMODE1: In Hardware Mode (BIS[1:0] = 11), it selects the receive side
operating mode.