cx28560 Mindspeed Technologies, cx28560 Datasheet - Page 55

• Manufacturer Part Number: cx28560
• Description: Hdlc Controller
• Manufacturer: Mindspeed Technologies

CX28560 Data Sheet
Table 2-3. Register 1, Address 04h (2 of 2)
28560-DSH-001-B
Bit Field
9
8
7
6
5
4
3
2
1
0
Name
—
—
—
—
—
—
—
—
—
—
Reset
Value
0
0
0
0
0
0
0
0
0
0
Type
RW
RW
RW
RW
RW
RO
RO
RO
RO
RO
Mindspeed Technologies™
Fast back-to-back enable.
This bit controls whether or not the CX28560, while acting as master, can
perform fast back-to-back transactions to different devices. The configuration
software routine sets this bit if all bus agents in the system are fast back-to-
back capable.
If 1, the CX28560 can generate fast back-to-back transactions to different
agents.
If 0, the CX28560 can generate fast back-to-back transactions to the same
agent.
Note: This bit would be presumably set by the system configuration routine
after ensuring that all targets on the same bus had the Fast Back-to-Back
Capable Bit set. If the target is unable to provide the fast back-to-back
capability, the target does not implement this bit and it is automatically
returned as zero when Status register is read.
SERR enable.
If 1, disables the CX28560’s SERR* driver.
If 0, enables the CX28560’s SERR* driver and allows reporting of address
parity errors.
Wait cycle control. The CX28560 does not support address stepping.
Parity error response.
This bit controls the CX28560’s response to parity errors.
If 1, the CX28560 takes normal action when a parity error is detected on a cycle
as the target.
If 0, the CX28560 ignores parity errors.
VGA palette snoop. Unused.
Memory write and invalidate.
The only write cycle type the CX28560 generates is memory write.
Special cycles.
Unused. the CX28560 ignores all special cycles.
Bus master.
If 1, the CX28560 is permitted to act as bus master.
If 0, the CX28560 is disabled from generating PCI accesses.
Memory space. Access control.
If 1, enables the CX28560 to respond to memory space access cycles.
If 0, disables the CX28560’s response.
I/O space accesses.
The CX28560 does not contain any I/O space registers.
Advance Information
Description
Host Interfaces
2
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9