gwixp425bdt Intel Corporation, gwixp425bdt Datasheet - Page 116

• Manufacturer Part Number: gwixp425bdt
• Description: Intel Xp42x Product Line Of Network Processors And Ixc1100 Control Plane Processor
• Manufacturer: Intel Corporation

Intel
Table 59.
March 2005
116
®
IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor
HPI-8 Mode Write Access Values
Notes:
1.
2.
3.
4.
5.
6.
7.
T
T
Symbol
data_setup
data_hold
T
recov
The address phase parameter (T1) must be set to a minimum value of 2. This value allows three T
clocks for the address phase. This setting is required to ensure that in the event of an HRDY, the
Intel
recognize the HRDY and hold the address phase for at least one clock pulse after the HRDY is de-
active.
The data setup phase parameter (T2) must be set to a minimum value of 2. This value allows three T
clocks for setup phase.
The data strobe phase parameter (T3) must be set to a minimum value of 1. This value allows two T
clocks for the data phase. This setting is required to ensure that in the event of an HRDY, the Intel
IXP42X Product Line and Intel
recognize the HRDY and hold the data setup phase for at least one clock pulse after the HRDY is de-
active.
Setting the recovery phase parameter (T5) will adjust the duration between successive accesses on
the Expansion Bus interface.
HRDY can be asserted by the DSP at any point in the access. The interface will not leave states T1 or
T3 until HRDY is de-active.
One cycle is the period of the Expansion Bus clock.
Timing tests were performed with a 70-pF capacitor to ground.
®
IXP42X Product Line and Intel
Data valid prior to the rising edge of the HDS1 data
strobe.
Data valid after the rising edge of the HDS1 data strobe.
Time required between successive accesses on the
expansion interface.
Document Number: 252479, Revision: 005
Parameter
®
IXC1100 Control Plane processors has had sufficient time to
®
IXC1100 Control Plane processors has had sufficient time to
Min.
4
4
2
Max.
36
17
5
Cycles
Cycles
Cycles
Units
Datasheet
Notes
3, 5,
3,
4,
6
6
®
6