IDT88K8483 Integrated Device Technology, IDT88K8483 Datasheet - Page 77

• Manufacturer Part Number: IDT88K8483
• Description: Spi-4 Exchange Document Issue 1.0
• Manufacturer: Integrated Device Technology

Registers
Register Organization:
Register Access Protocol.
Direct Access
interface.
Indirect Access
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.
IDT IDT88K8483
There are two types of register in the IDT88K8483:
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
The indirect access scheme uses the indirect access address register, indirect access control register and indirect access data register to map a 24
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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.
Read operations to a reserved address or reserved bit fields return 0.
Write operations to reserved address or bit fields are discarded.
Register Address Size
8
20
I
Register Address Size (Bits)
I
(Bits)
8
6
0x0 to 0x25
Register Address
C
D
A
Range (HEX)
Figure 44 Indirect Register Access Scheme
8
I
or 32
Table 14 Indirect Register Table
Register Data Size (Bits)
Table 13 Direct Register Table
I
77 of 162
3 2
20(16 )
8
I
C
D
A
Register Data Size
(Bits)
Read/Write, Read Only, Write Only.
Read/Write, Read Only, Write
Only.
Type
Type
October 20, 2006