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参数资料
| 型号： | IDT75T43100S66BS |
| 厂商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PBGA304 |
| 封装： | 31 X 31 MM, LOW PROFILE, THERMALLY ENHANCED, SBGA-304 |
| 文件页数： | 7/46页 |
| 文件大小： | 446K |
| 代理商： | IDT75T43100S66BS |
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6.42
15
IDT75T43100
Preliminary Information
IP Co-Processor 32K Entries
Commercial Temperature Ranges
Global Mask Registers (GMRs)
Global Mask Registers
There are a total of fifteen 72 bit read/write Global Mask Registers in
the IPC that are used during Lookup and Write operations.
For lookups if the GMR bit is set to a 1 this will enable the compare to
look at this bit, if the bit is set to a 0 this bit becomes a “X” or don’t care bit
in the lookup.
For writing if the bit in the GMR is set to a 1 the data presented on the
device data pins will be written into the desired location. If the GMR bit is
set to a 0, the data that already exists in this stored location will remain
unchanged. All writes are 72 bit only and will use only GMRs 10, 11 or
12.
Table 2.4 shows the mask functions for the Lookup and Write
operations. TheusercanalsoreadthecontentsofaparticularGlobalMask
Register by directly using the address shown in Table 2.5.
Operation
Mask Bit Values
Function
Lookup
1
Compare Bit
0
X, Don't Care
Write
1
Write to Bit
0
Bit Unaltered
D5325 tbl 08a
Table 2.4 — Mask Function
Table 2.5 — GMRs Addresses
Address
Register
Function
0001 0000
Global Mask Register 10
72 bit Lookup / Write
0001 0001
Global Mask Register 11
72 bit Lookup / Write
0001 0010
Global Mask Register 12
72 bit Lookup / Write
0001 0011
Global Mask Register 13
72 bit Lookup
0001 0100
Global Mask Register 14
72 bit Lookup
0001 0101
Global Mask Register 15
72 bit Lookup
0001 0110
Global Mask Register 16
72 bit Lookup
0010 0000
Global Mask Register 20
144 bit Lookup
0010 0001
Global Mask Register 21
144 bit Lookup
0010 0100
Global Mask Register 24
144 bit Lookup
0010 0101
Global Mask Register 25
144 bit Lookup
0011 0000
Global Mask Register 30
288 bit Lookup
0011 0001
Global Mask Register 31
288 bit Lookup
0011 0010
Global Mask Register 32
288 bit Lookup
0011 0011
Global Mask Register 33
288 bit Lookup
D5325 tbl 01a
The GMRs are selected using the CMD bits [3:0] and CMD bits [6:4]
of the Command Bus. Refer to the Command Bus for more detail. Table
3.1 shows how the Global Mask Registers are selected.
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