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參數(shù)資料
| 型號(hào)： | AM79C864AKC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | Physical Layer Controller With Scrambler (PLC-S) |
| 中文描述： | 0 CHANNEL(S), 100M bps, FDDI CONTROLLER, PQFP120 |
| 封裝： | PLASTIC, QFP-120 |
| 文件頁數(shù)： | 15/51頁 |
| 文件大?。?/td> | 271K |
| 代理商： | AM79C864AKC |
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AMD
P R E L I M I N A R Y
3-17
Am79C864A
Registers
The PLC-S contains twenty-six 16 bit registers ad-
dressed from 00 to 1A (hex). These registers are listed
in Table1.
Table 1. PLC-S Registers
Address
(hex)
Name
Type
00
PLC_CNTRL_A
read/write
01
PLC_CNTRL_B
read/write
02
INTR_MASK
read/write
03
XMIT_VECTOR
read/write (Note 1)
04
VECTOR_LENGTH
read/write (Note 1)
05
LE_THRESHOLD
read/write
06
C_MIN
read/write
07
TL_MIN
read/write
08
TB_MIN
read/write
09
T_OUT
read/write
0A
PLC_CNTRL_C
read/write
0B
LC_LENGTH
read/write
0C
T_SCRUB
read/write
0D
NS_MAX
read/write
0E
TPC_LOAD_VALUE
write only (Note 2)
0F
TNE_LOAD_VALUE
write only (Note 3)
10
PLC_STATUS_A
read only
11
PLC_STATUS_B
read only
12
TPC
read only
13
TNE
read only
14
CLK_DIV
read only
15
BIST_SIGNATURE
read only
16
RCV_VECTOR
read only
17
INTR_EVENT
read only (Note 4)
18
VIOL_SYM_CTR
read only (Note 4)
19
MIN_IDLE_CTR
read only (Note 4)
1A
LINK_ERR_CTR
read only (Note 4)
Notes:
1. Writable only when the PCM_SIGNALING bit in the
PLC_STATUS_B register is not set.
2. Writable only when the PCM is in the MAINT state.
3. Writable only when the PCM is in the MAINT state and
the NOISE_TIMER bit in the PLC_CONTROL_A
register is not set.
4. Register cleared on read.
PLC-S Control and Status Registers
The control and status information for the PLC-S is con-
tained in four registers.
PLC-S Control Register A (PLC_CNTRL_A)
PLC_CNTRL_A has address 00 (hex). It is readable and
writable. All bits of this register are cleared with the as-
sertion of
RST
. PLC_CNTRL_A is used for the following
functions:
I
Timer configuration
I
Specification of PCM MAINT state options
I
Counter interrupt frequency
I
PLC-S data path configuration
I
Execution of PLC-S Built In Self Test
Note that several bits of this register can only be written
if the PCM is in the OFF or MAINT state. If this register is
written when the PCM is in any other state these bits will
remain unchanged.
The PLC_CNTRL_A register bit assignments are listed
in Table 2.
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