Intel J1750 FH8065301562600 Manuel D’Utilisation
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Codes de produits
FH8065301562600
Register Access Methods
46
Datasheet
Most message bus registers are located in the Processor Transaction Router. The default
opcode messages for those registers are as follows:
opcode messages for those registers are as follows:
•
Message ‘Read Register’ Opcode: 06h
•
Message ‘Write Register’ Opcode: 07h
Registers with different opcodes will be specified as applicable. Pseudo code of a
message bus register read is shown below (where ReadOp==0x06):
message bus register read is shown below (where ReadOp==0x06):
•
MyMCR[31:24] = ReadOp; MyMCR[23:16] = port; MyMCR[15:8] = offset;
•
MyMCR[7:4] = 0xf
•
PCIWRITE(0, 0, 0, 0xD0, MyMCR)
•
Register_Snapshot = PCIREAD(0, 0, 0, 0xD4)
3.7
Register Field Access Types
Table 31. MCR Description
Field
MBPR Bits
OpCode (typically 10h for read, 11h for write)
31:24
Port
23:16
Offset/Register
15:08
Byte Enable
07:04
Table 32. MCRX Description
Field
MBPER Bits
Offset/Register Extension. This is used for messages sent to end points that require more
than 8 bits for the offset/register. These bits are a direct extension of MCR[15:8].
31:08
Table 33. Register Access Types and Definitions (Sheet 1 of 2)
Access Type
Meaning
Description
RO
Read Only
In some cases, if a register is read only, writes to this register location have no effect.
However, in other cases, two separate registers are located at the same location
where a read accesses one of the registers and a write accesses the other register.
See the I/O and memory map tables for details.
WO
Write Only
In some cases, if a register is write only, reads to this register location have no effect.
However, in other cases, two separate registers are located at the same location
where a read accesses one of the registers and a write accesses the other register.
See the I/O and memory map tables for details.
R/W
Read/Write
A register with this attribute can be read and written.
R/WC
Read/Write Clear
A register bit with this attribute can be read and written. However, a write of 1 clears
(sets to 0) the corresponding bit and a write of 0 has no effect.