mpc823rg Freescale Semiconductor, Inc, mpc823rg Datasheet - Page 370

• Manufacturer Part Number: mpc823rg
• Description: Mpc823 Powerquicc Integrated Communications Processor For Portable Systems
• Manufacturer: Freescale Semiconductor, Inc

Memory Controller
If you want to use an external TA response (SETA bit = 1), then these bits are not used.
SETA—Select External Transfer Acknowledge (GPCM only)
This bit indicates when the TA signal is externally generated once the GPCM is selected to
handle the memory access that was initiated to this memory region. Regardless of other
setup parameters for the GPCM, if SETA = 1, then all control signals of the memory
controller are negated after the externally generated TA signal is recognized.
TRLX—Timing Relaxed (GPCM only)
When this bit is set, it extends the timing of the signals controlling the memory devices once
the GPCM is selected to handle the memory access that was initiated to this memory region.
Refer to Table 15-2 (page 15-28) for more information.
0000 = 0 clock cycle wait state.
0001 = 1 clock cycle wait state.
0010 = 2 clock cycle wait states.
0011 = 3 clock cycle wait states.
0100 = 4 clock cycle wait states.
0101 = 5 clock cycle wait states.
0110 = 6 clock cycle wait states.
0111 = 7 clock cycle wait states.
1000 = 8 clock cycle wait states.
1001 = 9 clock cycle wait states.
1010 = 10 clock cycle wait states.
1011 = 11 clock cycle wait states.
1100 = 12 clock cycle wait states.
1101 = 13 clock cycle wait states.
1110 = 14 clock cycle wait states.
1111 = 15 clock cycle wait states.
0 = Internal or external transfer acknowledge can acknowledge this memory access,
1 = Transfer acknowledge must be provided by external logic.
0 = Timing is defined by the GPCM.
1 = Relaxed timing is defined by the GPCM.
whichever comes first.
Note: Regardless of other GPCM setup parameters, if the SETA bit equals one, then
all memory controller signals are negated after the externally generated TA
signal is recognized.
Freescale Semiconductor, Inc.
For More Information On This Product,
MPC823 REFERENCE MANUAL
Go to: www.freescale.com
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