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VM62(A) / VM42(A) User’s Manual Chapter 2 Functional Description

Table 2.5.3.2: Further Explanation of 68(EN)360 Mnemonics

Group Signal Name Mneumonic Function

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, SMCs, 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) from 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)

SMC SMC Receive Data SMRXD2-

SMRXD1

Serial data input to the SMCs (I)

SMC Transmit Data SMTXD2-

SMTXD1

Serial data output from the SMCs (O)

SMC Sync _SMSYN2-

_SMSYN1

SMC syncronization signal (I)