Cirrus Logic CS4970x4 - Manual (Page 16)

CS4970x4 Data Sheet
32-bit High Definition Audio Decoder DSP Family
DS752F1 16
5.12 Switching Characteristics — Serial Control Port - I
2
C Master Mode
Figure 6. Serial Control Port - I
2
C Master Mode Timing
5.13 Switching Characteristics — Parallel Control Port - Intel Slave Mode
Parameter Symbol Min Max Units
SCP_CLK frequency
1
1. The specification f
iicck
indicates the maximum speed of the hardware. The system designer should be aware that the actual
maximum speed of the communication port may be limited by the firmware application.
f
iicck
— 400 kHz
SCP_CLK low time t
iicckl
1.25 — µs
SCP_CLK high time t
iicckh
1.25 — µs
SCP_SCK rising to SCP_SDA rising or falling for START or STOP
condition
t
iicckcmd
1.25 — µs
START condition to SCP_CLK falling t
iicstscl
1.25 — µs
SCP_CLK falling to STOP condition t
iicstp
2.5 — µs
Bus free time between STOP and START conditions t
iicbft
3 — µs
Setup time SCP_SDA input valid to SCP_CLK rising t
iicsu
100 — ns
Hold time SCP_SDA input after SCP_CLK falling
2
2. This parameter is measured from the ViL level at the falling edge of the clock.
t
iich
0 — ns
SCP_CLK low to SCP_SDA out valid t
iicdov
— 36 ns
Parameter Symbol Min Typical Max Unit
Address setup before PCP_CS and PCP_RD low or PCP_CS and
PCP_WR low
t
ias
5 — — ns
Address hold time after PCP_CS and PCP_RD low or PCP_CS and
PCP_WR high
t
iah
5 — — ns
Read
SCP_CLK
SCP_SDA
0 1 6 7 8 0 1 7
t
iicckl
t
iicckh
t
iicsu
t
iich
A6 A0 R/W ACK LSB
8
ACK MSB
t
iicstp
6
t
iicdov
t
iicb
t
iicstscl
t
iicckcmd
f
iicck
t
iicckcmd
t
iicf
t
iicr