TNETV2501INPGF datasheet(159/197 Pages) TI1

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Electrical Specifications

159

December 2002 − Revised November 2008

SPRS206K

5.8

HOLD/HOLDA Timings

Table 5−15 and Table 5−16 assume testing over recommended operating conditions (see Figure 5−21).

Table 5−15. EMIF.HOLD/HOLDA Timing Requirements†

NO.

MIN

MAX

UNIT

toh(HOLDAL-HOLDL) Hold time, EMIF.HOLD low after EMIF.HOLDA low

† E = the EMIF input clock (ECLKIN, CPU/1 clock, CPU1/2 clock, or CPU1/4 clock) period in ns for EMIF.

Table 5−16. EMIF.HOLD/HOLDA Switching Characteristics†‡§

NO.

PARAMETER

MIN

MAX

UNIT

td(HOLDL-EMHZ)

Delay time, EMIF.HOLD low to EMIF Bus high impedance

td(EMHZ-HOLDAL)

Delay time, EMIF Bus high impedance to EMIF.HOLDA low

td(HOLDH-EMLZ)

Delay time, EMIF.HOLD high to EMIF Bus low impedance

td(EMLZ-HOLDAH)

Delay time, EMIF Bus low impedance to EMIF.HOLDA high

td(HOLDL-EKOHZ)

Delay time, EMIF.HOLD low to ECLKOUTx high impedance

td(HOLDH-EKOLZ)

Delay time, EMIF.HOLD high to ECLKOUTx low impedance

† E = the EMIF input clock (ECLKIN, CPU/1 clock, CPU1/2 clock, or CPU1/4 clock) period in ns for EMIF.

‡ EMIF Bus consists of: EMIF.CE[3:0], EMIF.BE[3:0], EMIF.D[31:0], EMIF.A[21:2], EMIF.ARE/SADS/SDCAS/SRE, EMIF.AOE/SOE/SDRAS, and

EMIF.AWE/SWE/SDWE, EMIF.SDCKE, and EMIF.SOE3.

§ The EKxHZ bits in the EMIF Global Control Registers (EGCR1, EGCR2) determine the state of the ECLKOUTx signals during EMIF.HOLDA.

If EKxHZ = 0, ECLKOUTx continues clocking during HOLD mode. If EKxHZ = 1, ECLKOUTx goes to high impedance during HOLD mode, as

shown in Figure 5−21.

¶ All pending EMIF transactions are allowed to complete before EMIF.HOLDA is asserted. If no bus transactions are occurring, then the minimum

delay time can be achieved. Also, bus hold can be indefinitely delayed by setting NOHOLD = 1.

EMIF.HOLD

EMIF.HOLDA

EMIF Bus†

DSP Owns Bus

External Requestor

Owns Bus

DSP Owns Bus

5501

ECLKOUTx

† EMIF Bus consists of: EMIF.CE[3:0], EMIF.BE[3:0], EMIF.D[31:0], EMIF.A[21:2], EMIF.ARE/SADS/SDCAS/SRE, EMIF.AOE/SOE/SDRAS, and

EMIF.AWE/SWE/SDWE, EMIF.SDCKE, and EMIF.SOE3.

Figure 5−21. EMIF.HOLD/HOLDA Timings

TNETV2501INPGF Datasheet(PDF) 159 Page - Texas Instruments

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