CN8478/CN8474A/CN8472A/CN8471A
7.0 Electrical and Mechanical Specifications
Multichannel Synchronous Communications Controller (MUSYCC™)
7.2 Timing and Switching Specifications
Table 7-8. PCI I/O Timing Parameters, 33 MHz PCI Clock
Symbol
Tval
Parameter
Min
Max
11
12
13
28
—
Unit
ns
PCLK to Signal Valid Delay—Bused Signal(1, 2, 4)
PCLK to Signal Valid Delay—Point To Point(1, 2)
Float to Active Delay(3)
2
2
Tval (ptp)
Ton
ns
—
—
7
ns
Active to Float Delay(3)
Toff
ns
Input Setup Time to Clock—Bused Signal(2)
Input Setup Time to Clock—Point To Point(2)
Input Hold Time from Clock(5)
Tds
ns
Tsu (ptp)
Tdh
10, 12
0
—
ns
—
ns
NOTE(S):
(1)
Minimum and maximum times are evaluated at 80 pF equivalent load. Actual test capacitance may vary, and results should
be correlated to these specifications.
REQ* and GNT* are the only point-to-point signals and have different output valid delay and input setup times than bused
signals. GNT* has a setup of 10; REQ* has a setup of 12.
For purposes of active/float timing measurements, the high-Z or off state is when the total current delivered through the
component pin is less than or equal to the leakage current specification at 80 pF equivalent load.
TVAL = 17 ns max for INTA.
(2)
(3)
(4)
(5)
Tdh = 0.5 ns min for GNT, IDSEL, and IRDY.
Table 7-9. PCI I/O Timing Parameters, 66 MHz PCI Clock
Symbol
Tval
Parameter
Min
2
Max
6
Units
ns
PCLK to Signal Valid Delay—Bused Signal(1, 2)
PCLK to Signal Valid Delay—Point To Point(1, 2)
Float to Active Delay(3)
Tval (ptp)
Ton
2
6
ns
2
—
14
—
—
—
ns
Active to Float Delay(3)
Toff
—
3
ns
Input Setup Time to Clock—Bused Signal(2)
Input Setup Time to Clock—Point To Point(2)
Input Hold Time from Clock
Tds
ns
Tsu (ptp)
Tdh
5
ns
0
ns
NOTE(S):
(1)
Minimum and maximum times are evaluated at 80 pF equivalent load. Actual test capacitance may vary, and results should
be correlated to these specifications.
REQ* and GNT* are the only point-to-point signals and have different output valid delay and input setup times than bused
signals. GNT* has a setup of 10; REQ* has a setup of 12.
For purposes of active/float timing measurements, the high-Z or off state is when the total current delivered through the
component pin is less than or equal to the leakage current specification at 80 pF equivalent load.
(2)
(3)
100660E
Conexant
7-7
CONEXANT [ CONEXANT SYSTEMS, INC ]
