CS89712 datasheet(121/170 Pages) CIRRUS

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CS89712

DS502PP2

121

3.18.6

Transmitter Event Register (TxEvent, address offset 128h)

TxEvent gives the event status of the last packet transmitted.

Reset value is:

0000 0000 0000 1000

Notes:

1.In any event register, like TxEvent, all bits are cleared upon readout. The software is responsible for

processing all event bits.

2.TxOK (Bit 8) and the Number-of-Tx-Collisions (Bits E-B) are used in normal packet transmission.All

other bits (6, 7, 9, A, and F) give the status of abnormal transmit operation.

7:6

5:0

E:B

RSVD

001000

16coll

Number-of-Tx-collisions

Jabber

Out-of-window

TxOK

Bit

Description

5:0

001000: These bits provide an internal address used by the CS89712 to identify this as register

8, the Transmitter Event Register.

7:6

RSVD: Reserved. must be a “0” when writing to this register.

TxOK: This bit is set if the last packet was completely transmitted (Jabber (Bit A), out-of-win-

dow-collision (Bit 9), and 16Coll (Bit F) must all be clear). If TxOKiE (Register 7, TxCFG, Bit 8)

is set, there is an interrupt.

Out-of-Window: This bit is set if a collision occurs more than 512 bit times after the first bit of

the preamble. When this occurs, the CS89712 forces a bad CRC and terminates the transmis-

sion. If Out-of-windowiE (Register 7, TxCFG, Bit 9) is set, there is an interrupt

Jabber: If the last transmission is longer than 26 msec, then the packet output is terminated by

the jabber logic and this bit is set. If JabberiE (Register 7, TxCFG, Bit A) is set, there is an inter-

rupt.

E:B

#-of-TX-collisions: These bits give the number of transmit collisions that occurred on the last

transmitted packet. Bit B is the LSB. If AnycolliE (Register 7, TxCFG, Bit B) is set, there is an

interrupt when any collision occurs.

16coll: This bit is set if the CS89712 encounters 16 normal collisions while attempting to trans-

mit a particular packet. When this happens, the CS89712 stops further attempts to send that

packet. If 16colliE (Register 7, TxCFG, Bit F) is set, there is an interrupt.

Table 71. Transmitter Event

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