S29GL01GS datasheet(79/104 Pages) SPANSION

79 / 104 page

March 16, 2012 S29GL_128S_01GS_00_06

GL-S MirrorBit® Family

Data

She e t

10.3.2

Hardware (Warm) Reset

During Hardware Reset (tRPH) the device will draw ICC5 current.

When RESET# continues to be held at VSS, the device draws CMOS standby current (ICC4). If RESET# is

held at VIL, but not at VSS, the standby current is greater.

If a Cold Reset has not been completed by the device when RESET# is asserted Low after tVCS, the Cold

Reset# EA will be performed instead of the Warm RESET#, requiring tVCS time to complete.

See Figure 10.4, Hardware Reset on page 79.

After the device has completed POR and entered the Standby state, any later transition to the Hardware

Reset state will initiate the Warm Reset Embedded Algorithm. A Warm Reset is much shorter than a Cold

Reset, taking tens of µs (tRPH) to complete. During the Warm Reset EA, any in progress Embedded Algorithm

is stopped and the EAC is returned to its POR state without reloading EAC algorithms from non-volatile

memory. After the Warm Reset EA completes, the interface will remain in the Hardware Reset state if

RESET# remains Low. When RESET# returns High the interface will transit to the Standby state. If RESET#

is High at the end of the Warm Reset EA, the interface will directly transit to the Standby state.

If POR has not been properly completed by the end of tVCS, a later transition to the Hardware Reset state will

cause a transition to the Power-on Reset interface state and initiate the Cold Reset Embedded Algorithm.

This ensures the device can complete a Cold Reset even if some aspect of the system Power-On voltage

ramp-up causes the POR to not initiate or complete correctly. The RY/BY# pin is Low during cold or warm

reset as an indication that the device is busy performing reset operations.

Hardware Reset is initiated by the RESET# signal going to VIL.

Figure 10.4 Hardware Reset

RESET#

CE#

tRP

tRPH

tRH

tCEH

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