參數(shù)資料
型號： IDT88K8483BRI
廠商： IDT, Integrated Device Technology Inc
文件頁數(shù)： 138/162頁
文件大?。?/td> 0K
描述： IC SPI-4 EXCHANGE 3PORT 672-BGA
標(biāo)準(zhǔn)包裝： 24
系列： *
其它名稱： 88K8483BRI
77 of 162
October 20, 2006
IDT IDT88K8483
Registers
Register Organization:
There are two types of register in the IDT88K8483:
◆
Direct Registers: Direct registers are used for high-priority registers such as interrupts and for access to the indirect registers. Direct registers
can be accessed more quickly than indirect registers. All direct access registers are one byte wide. Direct registers used for accessing indirect
registers are known as indirect access registers.They consist of 8 bit address registers, data registers and control registers.The direct registers
address space, size and type is shown in Table 13.
◆
Indirect registers: Indirect access registers are used for configuration, maps, etc. They are accessed via the direct register space by means
of a protocol which maps microprocessor interface pins A[5:0] D[7:0] and control pins to internal register space A[19:0], D[31:0], and
Control[7:0]. The indirect register address space and register size is shown in Table 14.
Register Access Protocol.
Direct Access
The direct access registers have 8 bit data (one byte data) and 8 bits address as shown in table 13.These are accessed via the microprocessor
interface.
◆
Read operations to a reserved address or reserved bit fields return 0.
◆
Write operations to reserved address or bit fields are discarded.
Indirect Access
The indirect access scheme uses the indirect access address register, indirect access control register and indirect access data register to map a 24
bit indirect address, and 32 bit data into the indirect register. The control register validates the access request and performs operations accordingly.
The direct registers used for indirect access are shown in Table 15.
Figure 44 Indirect Register Access Scheme
Register Address Size
(Bits)
Register Address
Range (HEX)
Register Data Size
(Bits)
Type
8I
0x0 to 0x25
8I
Read/Write, Read Only, Write
Only.
Table 13 Direct Register Table
Register Address Size (Bits)
Register Data Size (Bits)
Type
20I
8I or 32I
Read/Write, Read Only, Write Only.
Table 14 Indirect Register Table
Pro
ces
so
ri
n
te
rfa
ce
D
ire
ct
a
cc
e
sse
d
spac
e
In
d
ire
ct
a
cc
e
sse
d
sp
a
ce
A
D
C
A
D
C
8
6
20(16)
32
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