Reset Timing - Texas Instruments TMS320C6712D User Manual

Note: If a configuration pin must be routed out from the device, the internal pullup/pulldown (IPU/IPD) resistor
should not be relied upon; TI recommends the use of an external pullup/pulldown resistor.
timing requirements for reset
NO. NO.
1 t w(RST) Pulse duration, RESET
Setup time, boot configuration bits valid before RESET high §
12 t su(BOOT)
Hold time, boot configuration bits valid after RESET high §
13 t h(BOOT)
† P = 1/CPU clock frequency in ns. For example, when running parts at 150 MHz, use P = 6.7 ns.
‡ For this device, the PLL is bypassed immediately after the device comes out of reset. The PLL Controller can be programmed to change the PLL
mode in software. For more detailed information on the PLL Controller, see the TMS320C6000 DSP Software-Programmable Phase-Lock Loop
(PLL) Controller Reference Guide (literature number SPRU233).
§ The Boot and device configurations bits are latched asynchronously when RESET is transitioning high. The Boot and device configurations bits
consist of: BOOTMODE[1:0] and LENDIAN.
switching characteristics over recommended operating conditions during reset
NO. NO.
2 t d(RSTH-ZV)
3 t d(RSTL-ECKOL)
4 t d(RSTH-ECKOV)
5 t d(RSTL-CKO2IV)
6 t d(RSTH-CKO2V)
7 t d(RSTL-CKO3L)
8 t d(RSTH-CKO3V)
9 t d(RSTL-EMIFZHZ)
10 t d(RSTL-EMIFLIV)
11 t d(RSTL-Z1HZ)
¶ P = 1/CPU clock frequency in ns.
Note that while internal reset is asserted low, the CPU clock (SYSCLK1) period is equal to the input clock (CLKIN) period multiplied by 8. For
example, if the CLKIN period is 20 ns, then the CPU clock (SYSCLK1) period is 20 ns x 8 = 160 ns. Therefore, P = SYSCLK1 = 160 ns while
internal reset is asserted.
# The internal reset is stretched exactly 512 x CLKIN cycles if CLKIN is used (CLKMODE0 = 1). If the input clock (CLKIN) is not stable when RESET
is deasserted, the actual delay time may vary.
|| EMIF Z group consists of:
EA[21:2], ED[15:0], CE[3:0], BE[1:0], ARE/SDCAS/SSADS, AWE/SDWE/SSWE, AOE/SDRAS/SSOE and
HOLDA
EMIF low group consists of: BUSREQ
Z group consists of: CLKR0, CLKR1, CLKX0, CLKX1, FSR0, FSR1, FSX0, FSX1, DX0, DX1, TOUT0, and TOUT1.
FLOATING POINT DIGITAL SIGNAL PROCESSOR

RESET TIMING

†‡
(see Figure 39)
PARAMETER PARAMETER
Delay time, external RESET high to internal reset
high and all signal groups valid #||
Delay time, RESET low to ECLKOUT high impedance
Delay time, RESET high to ECLKOUT valid
Delay time, RESET low to CLKOUT2 high impedance
Delay time, RESET high to CLKOUT2 valid
Delay time, RESET low to CLKOUT3 low
Delay time, RESET high to CLKOUT3 valid
Delay time, RESET low to EMIF Z group high impedance ||
Delay time, RESET low to EMIF low group (BUSREQ) invalid ||
Delay time, RESET low to Z group high impedance ||
•
POST OFFICE BOX 1443
SPRS293A − OCTOBER 2005 − REVISED NOVEMBER 2005
CLKMODE0 = 1
HOUSTON, TEXAS 77251−1443
TMS320C6712D
−150
UNIT UNIT
MIN MAX
100 ns
2P ns
2P ns
¶
(see Figure 39)
−150
UNIT UNIT
MIN MAX
512 x CLKIN
ns
period
0 ns
6P ns
0 ns
6P ns
0 ns
6P ns
0 ns
0 ns
0 ns
83