32 en_rxpdr (receive pool descriptor pointer), 33 en_ccr (configuration register), 34 en_isr (interrupt serves register) – NEC Network Controller uPD98502 User Manual
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CHAPTER 5 ETHERNET CONTROLLER
298
Preliminary User’s Manual S15543EJ1V0UM
5.2.32 En_RXPDR (Receive Pool Descriptor Pointer)
Bits
Field
R/W
Default
Description
31
Reserved
R/W
0
Reserved for future use. Write a 0.
30:28
AL[2:0]
R/W
0
Alert Level
27:16
Reserved
R/W
0
Reserved for future use. Write 0s.
15:0
RNOD
[15:0]
R/W
0
Remaining Number of Descriptor
5.2.33 En_CCR (Configuration Register)
Bits
Field
R/W
Default
Description
31:1
Reserved
R/W
0
Reserved for future use. Write 0s.
0
SRT
R/W
0
Software Reset
5.2.34 En_ISR (Interrupt Serves Register)
Bits
Field
R/W
Default
Description
31:16
Reserved
RC
0
Reserved for future use.
15
XMTDN
RC
0
Transmit Done
14
TBDR
RC
0
Transmit Buffer Descriptor Request at Null
13
TFLE
RC
0
Transmit Frame Length Exceed
12
UR
RC
0
Underrun
11
TABR
RC
0
Transmit Aborted
9:8
Reserved
RC
0
Reserved for future use.
10
TCFRI
RC
0
Control Frame Transmit
7
RCVDN
RC
0
Receive Done
6
RBDRS
RC
0
Receive Buffer Descriptor Request at alert level
5
RBDRU
RC
0
Receive Buffer Descriptor Request at zero
4
OF
RC
0
Overflow
3
LFAL
RC
0
Link Failed
2:1
Reserved
RC
0
Reserved for future use.
0
CARRY
RC
0
Carry Flag:
CARRY indicates an overflow of the statistics counters