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Motorola MC68838 User Manual page 22

Media access controller
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Table of Contents
Register Name
Control Register A
Control Register B
Interrupt Mask Register A
Interrupt Mask Register B
Interrupt Mask Register C
My Short Address Register
My Long Address Register A
My Long Address Register B
My Long Address Register C
Target Request Time Register
TVX, TRT Initial Timer Parameter Register TVX_VALUE & T_MAX
Revision Number Register
Void Time Register
Token Count Register
Frame Count Register
Lost and Error Count Register
Interrupt Event Register A
Interrupt Event Register B
Interrupt Event Register C
Receive Status Register
Transmit Status Register
TRT Time Remaining Register A
TRT Time Remaining Register B
Information Field Register A
Information Field Register B
BIST Signature Register
TVX Timer Register
TRT Timer Register A
TRT Timer Register B
THT Timer Register A
THT Timer, Sent Count Registers
Packet Request Register
Receive CRC Register A
Receive CRC Register B
Transmit CRC Register A
Transmit CRC Register B
3- 2
Table 3-1. MAC Registers
Mnemonic
MAC_CNTRL_A
MAC_CNTRL_B
INTR_MASK_A
INTR_MASK_B
INTR_MASK_C
MSA
MLA_A
MLA_B
MLA_C
T_REQ
REV_NO_REG
VOID_TIME
TOKEN_CT
FRAME_CT
LOST_CT & ERROR_CT
INTR_EVENT_A
INTR_EVENT_B
INTR_EVENT_C
RX_STATUS
TX_STATUS
T_NEG_A
T_NEG_B
INFO_REG_A
INFO_REG_B
BIST_SIGNATURE
TVX_TIMER
TRT_TIMER_A
TRT_TIMER_B
THT_TIMER_A
SENT_COUNT &THT_TIMER_B
PKT_REQUEST
RC_CRC_A
RC_CRC_B
TX_CRC_A
TX_CRC_B
MC68838 USER'S MANUAL
NPA5–NPA0
No. of
Hex
Bits
00
16
Read/Write
01
16
Read/Write
02
16
Read/Write
03
16
Read/Write
04
16
Read/Write
10
16
Read/Cntl Write
11
16
Read/Cntl Write
12
16
Read/Cntl Write
13
16
Read/Cntl Write
14
16
Read/Cntl Write
15
16
Read/Cntl Write
1C
12
1E
16
1F
16
Read-Only Clear
20
16
Read-Only Clear
21
12
Read-Only Clear
22
16
Read-Only Clear
23
16
Read-Only Clear
1D
3
Read-Only Clear
24
16
Read-Only
25
16
Read-Only
26
16
27
8
28
16
Read-Only
29
16
Read-Only
2A
16
Read-Only
2B
16
2C
16
Read-Only
2D
8
Read-Only
2E
16
Read-Only
2F
16
Read-Only
30
16
Read-Only
31
16
Read-Only
32
16
Read-Only
33
16
Read-Only
34
16
Read-Only
MOTOROLA
Type
Read-Only
Read-Only
Read-Only
Read-Only
Read-Only

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