CN8478 Datasheet, PDF (191/221 Pages) Conexant Systems, Inc – Multichannel Synchronous Communications Controller (MUSYCC)

CN8478/CN8474A/CN8472A/CN8471A
7.0 Electrical and Mechanical Specifications
Multichannel Synchronous Communications Controller (MUSYCC™)
7.2 Timing and Switching Specifications
Table 7-6. PCI Clock (PCLK) Waveform Parameters, 66 MHz PCI Clock
Symbol
Parameter
Min
Max
Unit
T_cyc
Clock Cycle Time⁽¹⁾
15
—
ns
T_high
Clock High Time
6
—
ns
T_low
Clock Low Time
6
—
ns
—
Clock Slew Rate⁽²⁾
1
4
V/ns
V_ptp
Peak-to-Peak Voltage
0.4 V_dd
—
V
NOTE(S):
(1) _{MUSYCC works with any clock frequency between DC and 66 MHz, nominally. The clock frequency can be changed at any}
time during operation of the system as long as clock edges remain monotonic, and minimum cycle and high and low times
are not violated. The clock can only be stopped in a low state.
(2) _{Rise and fall times are specified in terms of the edge rate measured in V/ns. This slew rate must be met across the minimum}
peak-to-peak portion of the clock waveform.
Figure 7-1. PCI Clock (PCLK) Waveform
0.5V_dd V
0.4V_dd
0.3V_dd
8478_023
0.6 V_dd
T_high
T_cyc
0.2 V_dd
T_low
V_ptp
min
100660E
Conexant
7-5