參數資料
型號: GT-48208
廠商: Galileo Technology Services, LLC
英文描述: Advanced Switched Ethernet Controllers for 10+10/100 BaseX(高級交換式 10+10/100 BaseX以太網控制器)
中文描述: 先進的交換式以太網控制器的10 10/100 BaseX(高級交換式10 10/100 BaseX以太網控制器)
文件頁數: 104/135頁
文件大?。?/td> 1619K
代理商: GT-48208
GT-482xx Switched Ethernet Controllers for 10+10/100 BaseX
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TECHNOLOGY
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Revision 1.2
16.3
CPU Interface Pin Definitions
The CPU interface pins change definitions depending on the CPU mode chosen. Table 18 shows a summary of
how to connect CPU pins to the GT-482xx.
16.4
Selecting the CPU Mode
The CPU Mode is selected at RESET via the Ras*, Cas* and DRAM WE* signals, as shown in Table 19. These
pins should be pulled the appropriate level by pull-up/down resistors. Strapping options not shown are reserved
and must not be used.
16.5
GT-482xx Base Address
Each GT-482xx in a system has a base address in the memory map. The GT-482xx compares bits 31:27 of the
address to its own base address. The GT-482xx will respond only if bits AD[31:27] in the address phase of the
cycle are equal to the GT-482xx Base Address Register.
Table 18: CPU Interface Pin Mappings
C P U Inte r f ace P ins/M ode D e f init ion
CPU
M o d e
Ad s *
W /R*
Bl a s t *
B u r s t A ddr
[ 2 : 1 ]
R eady*
R d C E n*
i960Jx
Ads*
W/R*
Blast*
pull up
RdyRcv*
pull up
R3041
Wr*
Rd*
Burst*
Addr[3:2]
Ack*
RdCEn*
GT
Ads*
DevRW*
CSTiming*
BAdr[2:1]
Ready*
BAdr[0]
ColdFire
TS*
RW*
SIZE[0]
pull up
DA*[0]
pull up
Table 19: CPU Mode Selection
C P U M o d e
Ra s *
Ca s *
DRAM W E *
i960
Jx
0
ColdFire
0
1
R3041
0
1
0
GT
0
1
Table 20: Burst Size for Different CPU Modes
C P U M ode
N u m b er of Long
W o r d R eads
N u mber of Long Wo r d
Wr it e s
i960Jx
1,2,3,4
ColdFire
1,4
R3041
1,4
1
GT
1,2,3,4,5,6,7,8
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