MB86960 Datasheet, PDF (6/65 Pages) Fujitsu Component Limited. – NETWORK INTERFACE CONTROLLER with ENCODER/DECODER (NICE)

MB86960
PIN DESCRIPTIONS
Buffer Memory Interface Pins
SYMBOL TYPE
DESCRIPTION
BCS0
BSC1
O
BUFFER CHIP SELECT: BCS1 and BSC0 are the chip select lines, most significant byte and least
O
significant byte respectively, of the dedicated buffer SRAMs, Active low.
BOE
O
BUFFER OUTPUT ENABLE: This active low signal is the output enable for the Buffer SRAM, and
is asserted by NICE during buffer memory read cycles.
BWE
O
BUFFER WRITE ENABLE: Active low. Used as a write strobe to the buffer SRAM memory during
write operations.
BD<15:0>
BA<15:0>
B
BUFFER DATA: Data lines between the SRAM buffer memory and NICE. This SRAM data bus is
B
configurable for an 8-bit or 16-bit data size by BUFFER BYTE/BUFFER WORD, BB/BW, in
DLCR6<4>. The transfer byte order within a word, most significant or least-significant byte first, is
determined by DATA_ORDER, DLCR7<1>.
O
BUFFER ADDRESS: These lines address up to 64 kilobytes of SRAM buffer memory.
O
Network Interface Pins
SYMBOL TYPE
DESCRIPTION
TXDATA+
TXDATA–
O TRANSMIT INTERFACE PAIR: These are the differential outputs to the transceiver for transmitting.
O
RXDATA+
RXDATA–
I
RECEIVED DATA: These are the Manchester differential inputs from the transceiver to the receiver.
I
COL+
COL–
I
COLLISION: These differential inputs are driven with a 10 MHz signal when the transceiver detects a
I
collision on the media.
AC/DC
I
AC/DC COUPLING SELECT: AC/DC = 1 selects AC coupling; 0 selects DC coupling for the
TXDATA ± outputs. When AC coupling is selected, both TXDATA+ and TXDATA– are driven to the
same output voltage level during the transmit idle period to prevent saturation of the isolation
transformer. With DC coupling, these outputs remain at a 1 level during idle periods.
System Clock Pins
SYMBOL TYPE
X1
I
X2
O
CKOUT
O
DESCRIPTION
CRYSTAL INPUT: Connection for one side of the 20 MHz crystal, or input for an external 20 MHz
clock source.
CRYSTAL OUTPUT: Connection for the other side of the 20 MHz crystal. Leave unconnected if an
external clock is used.
CLOCK OUTPUT: 20 MHz free-running clock output provided by the crystal
oscillator circuit.