參數(shù)資料
型號(hào): 83C795
廠商: SMSC Corporation
英文描述: Ethernet System Controller
中文描述: 以太網(wǎng)系統(tǒng)控制器
文件頁數(shù): 68/136頁
文件大小: 1996K
代理商: 83C795
The recall of LAN address registers are from the
bank selected by the 4-bit EA field and are written
to registers at I/O locations 08H-0FH, SWH=0.
Upon RESET, the EA field points to Bank 6. Unless
the EEROM load is bypassed by jumpers (INIT =
0000), the 83C795 recalls either 8 or 16 registers.
When Config #6 is jumpered, only 8 registers are
recalled and the hardware defaults are used for the
configuration registers. All other initial
configurations result in 16 register loads. These are
done automatically. Since EA always initializes to
Bank 6, the initial load from the EEROM always
pulls in the LAN address from same location.
Refer to Figure 6-6 for a depiction of the EEROM
register logic.
0
1
2
3
4
5
6
7
8
0
1
2
3
4
5
6
7
8
9
A
9
A
LAR0
LAR0
GCR2
ALWAYS TO BANK EA
ALWAYS FROM BANK EA
(EA powers up at ’6’)
RUPON RETO INIT JUMPERS.
(No recall from Bank 6.)
BANKS OF 8 REGISTERS IN EEROM
LAR1
LAR1
GCR2
ERFAL
ERFAL
LAR2
LAR2
RESET
DISABLE ADAPTER
LOINTO REGISTERS
BYPASS EEROM LOAD
ARE INIT JUMPERS IN
POSITION ’6’
RECALL
YES
YES
NO
NO
YES
NO
ENABLE ADAPTER
RETRIEVE 8 REGISTERS
LANBY EA FIELD INTO
RETRIEVE CONFIGURATION
INDEXED BY INIT JUMPERS
REGISTERS FROM BANK
INDEXED BY EA FIELD
IAR
IAR
LAR3
LAR3
RAR
RAR
LAR4
LAR4
BIO
BIO
LAR5
LAR5
GCR
GCR
BDID
BDID
CHK
CHK
B
C
D
E
F
B
C
D
E
F
FIGURE 6-6. EEROM REGISTER LOGIC
HOST INTERFACE SECTION
83C795
55
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