ACK/NAK Data Flow Examples

Setup 1

RES	0x00 (disabled)
REQ	0x00 (disabled)
STX	0x00 (disabled)
ETX	0x00 (disabled)
ACK	0x06
NAK	0x15
LRC	disabled

Transfer 1

HOST_TX	<K141,0>
imager_TX	`ACK'

Transfer 2

HOST_TX	<K141?>
imager_TX	`ACK'
imager_TX	<K141,0>
HOST_TX	`ACK'

Error Condition

Transfer 1

imager_TX	symbol data
HOST_TX	`NAK' (host rejects)
imager_TX	symbol data (resend data)
HOST_TX	`ACK' (transaction complete)

Transfer 2

HOST_TX	<K141?>
imager_TX	`ACK'
imager_TX	<K141,0>
timeout reached...
timeout reached...
timeout reached...
Timeout Reached	transaction aborted, data is flushed

Setup 2

RES	0x00 (disabled)
REQ	0x00 (disabled)
STX	0x00 (disabled)
ETX	0x00 (disabled)
ACK	0x06
NAK	0x15
LRC	enabled

Transfer 1

HOST_TX	<K141,0>a
imager_TX	`ACK'

Transfer 2

HOST_TX	<K141?>B
imager_TX	`ACK'
imager_TX	<K141,0>a
HOST_TX	`ACK'

Error Condition

Transfer 1

HOST_TX	<k141,0>x (BAD LRC)
imager_TX	`NAK'
HOST_TX	<K141,0>a (GOOD LRC)
imager_TX	`ACK'

Setup 3

RES	0x00 (disabled)
REQ	0x00 (disabled)
STX	0x28 `(`
ETX	0x29 `)'
ACK	0x06
NAK	0x15
LRC	enabled

Transfer 1

HOST_TX	(<K141,0>)H
imager_TX	`ACK'

Transfer 2

HOST_TX	(<K141?>)k
imager_TX	`ACK'
imager_TX	(<K141,^M>)w
HOST_TX	`ACK'

Setup 4

RES	0x21 `!'
REQ	0x3D `='
STX	0x28 `(`
ETX	0x29 `)'
ACK	0x06
NAK	0x15
LRC	enabled

Transfer 1

HOST_TX	(<K141,0>)H
imager_TX	`ACK'

Transfer 2

HOST_TX	(<K100?>)n
imager_TX	`ACK'
HOST_TX	`!'
imager_TX	(<K100,8,0,0,1>)X
HOST_TX	`ACK'
imager_TX	`!'

Error Condition

Transfer 1

HOST_TX	(<K141,0>)H
imager_TX	`ACK'
HOST_TX	(<K100?>)n
imager_TX	`ACK'
HOST_TX	`!'
imager_TX	(<K100,8,0,0,1>)X
timeout reached...
imager_TX	`='
timeout reached...
imager_TX	`='
timeout reached...
imager_TX	`='
timeout reached...
imager_TX	`!'