PC97338 datasheet(207/221 Pages) NSC

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Note 1:

tCWN is the nominal pulse width of the modulation signal for Sharp-IR and CEIR modes. It is determined by the MCPW [2-0] and TXHSC bits in the

IRTXMC and RCCFG registers.

Note 2:

tCPN is the nominal period of the modulation signal for Sharp-IR and CEIR modes. It is determined by the MCFR [4-0] and TXHSC bits in the IRTXMC

and RCCFG registers.

Note 3:

tMMIN and tMMAX define the time range within which the period of the incoming subcarrier signal has to fall in order for the signal to be accepted by

the receiver. These time values are determined by the content of register IRRXDC and the setting of bit RXHSC in the RCCFG register.

Note 4:

tBTN is the nominal bit time in UART, Sharp-IR, SIR, MIR and CEIR modes.

Note 5:

tMWN is the nominal pulse width for MIR mode. It is determined by the MPW [3-0] and MDRS bits in the MIR_PW and IRCR2 registers.

Note 6:

The receiver pulse width requirements for various jitter values can be obtained by assuming a linear pulse-width/jitter relationship. For example, if

the jitter is +/- 10 ns, the width of a single pulse must fall between 84 and 165 ns.

Note 7:

The WRITE Signal will not change from low to high before DSTRB or ASTRB changes from low to high.

Note 8:

D7-0 is assumed to be valid 15 ns or more before WR becomes active.

Note 9:

When WAIT is low, tWSTa and tWWa are measured from the high-to-low transition of WR or RD; otherwise they are measured from the high-to-low

transition of WAIT.

8.4.2

Timing Diagrams

FIGURE 91. Clock Timing

tECHL

Figures 107,

108

BUSY or AFD Delay After STB or ACK Inactive

tECLL

Figures 107,

108

STB or ACK Active After BUSY or AFD Falling

Edge

0ns

MISCELLANEOUS TIMING

tISS

Figure 109

IRQn Signal Delay From SIRQI1,2,3

tCSD

Figure 110

CS1-0 Signals Delay From A15-0, WR and RD

tMRW

Figure 111

Master Reset Pulse Width

µs

tMRF

Figure 111

Output Signals Floating From Reset Active

700

tMRCia

Figure 111

Output Signals Inactive From Reset Active

300

Symbol

Figure

Parameter

Min

Max

Unit

tCL

tCH

PC97338 Datasheet(PDF) 207 Page - National Semiconductor (TI)

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