TMS320C6713_08 Datasheet, PDF (106/148 Pages) Texas Instruments – FLOATING-POINT DIGITAL SIGNAL PORCESSOR

TMS320C6713
FLOATINGĆPOINT DIGITAL SIGNAL PROCESSOR
SPRS186K − DECEMBER 2001 − REVISED OCTOBER 2005
ASYNCHRONOUS MEMORY TIMING
timing requirements for asynchronous memory cycles^{†‡§} (see Figure 33−Figure 34)
13PYPA−167
13PYP−200
NO.
13GDPA−200 _UNIT
13GDP−225
MIN MAX
3 tsu(EDV-AREH)
Setup time, EDx valid before ARE high
6.5
ns
4 th(AREH-EDV)
Hold time, EDx valid after ARE high
1
ns
6 tsu(ARDY-EKOH) Setup time, ARDY valid before ECLKOUT high
3
ns
7 th(EKOH-ARDY) Hold time, ARDY valid after ECLKOUT high
2.3
ns
† _{To ensure data setup time, simply program the strobe width wide enough. ARDY is internally synchronized. The ARDY signal is recognized in}
the cycle for which the setup and hold time is met. To use ARDY as an asynchronous input, the pulse width of the ARDY signal should be wide
enough (e.g., pulse width = 2E) to ensure setup and hold time is met.
‡ _{RS = Read setup, RST = Read strobe, RH = Read hold, WS = Write setup, WST = Write strobe, WH = Write hold. These parameters are}
programmed via the EMIF CE space control registers.
§ _{E = ECLKOUT period in ns}
switching characteristics over recommended operating conditions for asynchronous memory
cycles^{‡§¶} (see Figure 33−Figure 34)
NO.
PARAMETER
13PYPA−167
13PYP−200
13GDPA−200
13GDP−225
UNIT
MIN MAX
1 tosu(SELV-AREL) Output setup time, select signals valid to ARE low
2 toh(AREH-SELIV) Output hold time, ARE high to select signals invalid
5 td(EKOH-AREV) Delay time, ECLKOUT high to ARE valid
8 tosu(SELV-AWEL) Output setup time, select signals valid to AWE low
9 toh(AWEH-SELIV) Output hold time, AWE high to select signals and EDx invalid
10 td(EKOH-AWEV) Delay time, ECLKOUT high to AWE valid
RS*E − 1.7
RH*E − 1.7
1.5
WS*E − 1.7
WH*E − 1.7
1.5
ns
ns
7 ns
ns
ns
7 ns
11 tosu(EDV-AWEL) Output setup time, ED valid to AWE low
(WS−1)*E −
1.7
ns
‡ _{RS = Read setup, RST = Read strobe, RH = Read hold, WS = Write setup, WST = Write strobe, WH = Write hold. These parameters are}
programmed via the EMIF CE space control registers.
§ _{E = ECLKOUT period in ns}
¶ _{Select signals include: CEx, BE[3:0], EA[21:2], and AOE.}
106
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