DP8344 datasheet(167/184 Pages) NSC

167 / 184 page

60 Reference Section (Continued)

ECR

ERROR CODE REGISTER

Alternate R4 with SEC high read only

432

rsv

OVF

PAR

IES

LMBT

RDIS

OVF

Receiver oVerFlow

Set when the receiver

has processed 3 words and another complete

frame is received before the FIFO is read by the

CPU Cleared by reading ECR or by asserting

TRES

PAR

PARity error

Set when bad (odd) overall

word parity is detected in any receive frame

Cleared by reading

ECR

or by asserting

TRES

IES

Invalid Ending Sequence

Set when the

‘‘mini-code violation’’ is not correct during a 3270

3299 or 8-bit ending sequence Cleared by read-

ing ECR or by asserting TRES

LMBT

Loss of Mid-Bit Transition

Set when the ex-

pected Manchester Code mid-bit transition does

not occur within the allowed window Cleared by

reading ECR or by asserting TRES

RDIS

Receiver DISabled while active

Set when

transmitter is activated while receiver is active

without RPEN being asserted Cleared by reading

ECR or by asserting TRES

Further informa-

tion Section 32 Transceiver Functional Descrip-

tion

FBR

FILL-BIT REGISTER

Alternate R3 readwrite

76543210

FB7

FB6

FB5

FB4

FB3

FB2

FB1

FB0

FB7–0

Fill Bits

5250 fill-bit control Further informa-

tion Section 30 Transceiver

167

DP8344 Datasheet(PDF) 167 Page - National Semiconductor (TI)

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