Rainbow Electronics DS3170 - Manual (Page 33)

DS3170 DS3/E3 Single-Chip Transceiver
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PIN NAME TYPE PIN DESCRIPTION
positions of the data on the RSER pin. The signal goes high during each DS3/E3
payload bit and goes low during each DS3/E3 overhead bit. The signal is updated on
the positive clock edge of the referenced clock pin if the clock pin signal is not
inverted, otherwise it is updated on the falling edge of the clock. The signal is typically
referenced to the RCLKO receive clock output pin, but it can be referenced to the
RLCLK clock input pin.
This signal can be inverted.
Microprocessor Interface
D[15:8] IO Upper 8 Bits of the Bi-directional 16 or 8 bit data bus
D[15:8]: Upper bits of the 16-bit or 8-bit data bus used to input data during register
writes, and data outputs during register reads. The upper 8 bits are not used in 8 bit
bus mode. Not driven when
CS=1 or RST=0.
D[7]/
SPI_CPOL IO Bit 7 of Bi-directional data bus / SPI Bus Clock Polarity
D[7]: Bit 7 of the 16-bit or 8-bit data bus used to input data during register writes, and
data outputs during register reads. Not driven when
CS=1 or RST=0.
SPI_CPOL: This signal selects the clock polarity when SPI = 1. See Section 7.3.4.1
for detailed timing and functionality information. Default setting is low.
D[6]/
SPI_CPHA IO Bit 6 of Bi-directional data bus / SPI Bus Clock Phase
D[6]: Bit 6 of the 16-bit or 8-bit data bus used to input data during register writes, and
data outputs during register reads. Not driven when
CS=1 or RST=0.
SPI_CPHA: This signal selects the clock phase when SPI = 1. See Section 7.3.4.1 for
detailed timing and functionality information. Default setting is low.
D[5]/
SPI_SWAP IO Bit 5 of Bi-directional data bus / SPI Bit Order Swap
D[5]: Bit 5 of the 16-bit or 8-bit data bus used to input data during register writes, and
data outputs during register reads. Not driven when
CS=1 or RST=0.
SPI_SWAP: This signal is active when SPI=1. The address and data bit order is
swapped when SPI_SWAP is high. The R/W and B bit positions are never changed in
the control word.
0 = MSB is transmitted and received first.
1 = LSB is transmitted and received first.
D[4:3] IO Bits 4,3 of Bi-directional data bus
D[4:3]: Bits 3,4 of the 16-bit or 8-bit data bus used to input data during register writes,
and data outputs during register reads. Not driven when
CS=1 or RST=0.
D[2]/
SPI_SCLK IO Bit 2 of Bi-directional data bus / SPI Serial Clock Input < 10 MHz
D[2]: Bit 2 of the 16-bit or 8-bit data bus used to input data during register writes, and
data outputs during register reads. Not driven when
CS=1 or RST=0.
SPI_SCLK: SPI Serial Clock Input when SPI = 1.
D[1]/
SPI_MOSI IO Bit 1 of Bi-directional data bus / SPI Serial Bus Master-out Slave-in
D[1]: Bit 1 of the 16-bit or 8-bit data bus used to input data during register writes, and
data outputs during register reads. Not driven when
CS=1 or RST=0.
SPI_MOSI: SPI Serial Data Input (Master-out Slave-in) when SPI = 1.
D[0]/
SPI_MISO IO Bit 0 of Bi-directional data bus / SPI Serial Bus Master-in Slave-out
D[0]: Bit 0 of the 16-bit or 8-bit data bus used to input data during register writes, and
data outputs during register reads. Not driven when
CS=1 or RST=0.
SPI_MISO: SPI Serial Data Output (Master-in Slave-Out) when SPI = 1.
A[8:1] I Address bus (minus LSB) / Device Address [8:1]
A[8:1]: identifies the specific 16 bit registers, or group of 8 bit registers, being
accessed.
A[0] /
BSWAP Address bus LSB / Byte Swap / Device Address [0]
A[0]: This signal is connected to the lower address bit in 8 bit systems. (WIDTH=0)
1 = Output register bits 15:8 on D[7:0], D[15:8] not driven
0 = Output register bits 7:0 on D[7:0], D[15:8] not driven
BSWAP: This signal is tied high or low in 16 bit systems. (WIDTH=1)
1 = Output register bits 15:8 on D[7:0], 7:0 on D[15:8]
0 = Output register bits 7:0 on D[7:0], 15:8 on D[15:8]
ALE I Address Latch Enable
ALE: This signal is used to latch the address on the A[10:0] pins in multiplexed