SMJ320C6203 Datasheet, PDF (58/81 Pages) Texas Instruments – FIXED POINT SIGNAL PROCESSOR

SMJ320C6203
FIXEDĆPOINT DIGITAL SIGNAL PROCESSOR
SGUS033 – FEBRUARY 2002
EXPANSION BUS ASYNCHRONOUS PERIPHERAL TIMING (CONTINUED)
switching characteristics over recommended operating conditions for asynchronous peripheral
cycles^{†‡§¶} (see Figure 33–Figure 36)
NO.
PARAMETER
MIN
TYP MAX UNIT
1
tosu(SELV-XREL)
Output setup time, select
signals valid to XRE low
RS x P – 2
ns
2 toh(XREH-SELIV) Output hold time, XRE low to select signals invalid
5 tw(XREL)
Pulse width, XRE low
*RH x P – 2
ns
RST x P
ns
8 td(XRDYH-XREH) Delay time, XRDY high to XRE high
12
tosu(SELV-XWEL)
Output setup time, select
signals valid to XWE low
*3P
WS x P – 3
*4P + 5 ns
ns
13 toh(XWEH-SELIV) Output hold time, XWE low to select signals invalid
14 tw(XWEL)
Pulse width, XWE low
*WH x P – 2
ns
WST x P
ns
17 td(XRDYH-XWEH) Delay time, XRDY high to XWE high
*3P
*4P + 5 ns
*This parameter is not production tested.
† _{RS = Read Setup, RST = Read Strobe, RH = Read Hold, WS = Write Setup, WST = Write Strobe, WH = Write Hold. These parameters are}
programmed via the expansion bus XCE space control registers.
‡ _{P = 1/CPU clock frequency in ns. For example, when running parts at 200 MHz, use P = 5 ns.}
§ _{The sum of RS and RST (or WS and WST) must be a minimum of 4 in order to use XRDY input to extend strobe width.}
¶ _{Select signals include: XCEx, XBE[3:0]/XA[5:2], XOE; and for writes, include XD[31:0], with the exception that XCEx can stay active for an}
additional 7P ns following the end of the cycle.
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