Owner manual

VM162/VM172Chapter 2 Functional Description
Juli 23, 1997 Page 2- 29© PEP Modular Computers
Table 2.11: Further Explanation of 68(EN)360 Mnemonics
Group Signal Name Row B Signals Row C Signals
SCC Receive Data RXD4-RXD1 Serial receive data input to the SCCs (I)
Transmit Data TXD4-TXD1 Serial transmit data output from the SCCs (O)
Request to Send _RTS4-_RTS1 Request to send outputs indicate that the SCC is
ready to transmit data (O)
Clear to Send _CTS4-_CTS1 Clear to send inputs indicate to the SCC that data
transmission may begin (I)
Carrier Detect _CD4-_CD1 Carrier detect inputs indicate that the SCC should
begin reception of data (I)
Receive Start _RSTRT1 This output from SCC1 identifies the start of a
receive frame. Can be used by an Ethernet CAM to
perform address matching (O)
Receive Reject RRJCT1 This input to SCC1 allows a CAM to reject the
current Ethernet frame after it determines the frame
address did not match (I)
Clocks CLK8-CLK1 Input clocks to the SCCs, SMAs, SI and the baud
rate generators (I)
IDMA DMA Request _DREQ2-_DREQ1 A request (input) to an IDMA channel to start an
IDMA transfer (I)
DMA Acknowledge _DACK2-_DACK1 An acknowledgement (output) by the IDMA that an
IDMA transfer is in progress (O)
DMA Done _DONE2-_DONE1 A bidirectional signal that indicates the last IDMA
transfer in a block of data (I/O)
TIMER Timer Gate _TGATE2-
_TGATE1
An input to a timer that enables/disables the
counting function (I)
Timer Input TIN4-TIN1 Time reference input to the timer that allows it to
function as a counter (I)
Timer Output _TOUT4-_TOUT1 Output waveform (pulse or toggle) fromn the timer
as a result of a reference value being reached (O)
SPI SPI Master-In
Slave-Out
SPIMISO Serial data input to the SPI master (I); serial data
output from an SPI slave (O)
SPI Master-Out
Slave-In
SPIMOSI Serial data output from the SPI master (O); serial
data input to an SPI slave (I)
SPI Clock SPICLK Output clock from the SPI master (O); input clock
to the SPI slave (I)
SPI Select _SPISEL SPI slave select input (I)