MPC8548E Freescale, MPC8548E Datasheet - Page 23

• Manufacturer Part Number: MPC8548E
• Description: Integrated Processor
• Manufacturer: Freescale

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Figure 3
Freescale Semiconductor
At recommended operating conditions.
MDQS epilogue end
Notes:
1. The symbols used for timing specifications follow the pattern of t
2. All MCK/MCK referenced measurements are made from the crossing of the two signals ±0.1 V.
3. ADDR/CMD includes all DDR SDRAM output signals except MCK/MCK, MCS, and MDQ/MECC/MDM/MDQS.
4. Note that t
5. Determined by maximum possible skew between a data strobe (MDQS) and any corresponding bit of data (MDQ), ECC
6. All outputs are referenced to the rising edge of MCK[ n ] at the pins of the microprocessor. Note that t
inputs and t
(DD) from the rising or falling edge of the reference clock (KH or KL) until the output went invalid (AX or DX). For example,
t
(A) are setup (S) or output valid time. Also, t
(K) goes low (L) until data outputs (D) are invalid (X) or data output hold time.
from the rising edge of the MCK[ n ] clock (KH) until the MDQS signal is valid (MH). t
of the MDQS override bits (called WR_DATA_DELAY) in the TIMING_CFG_2 register. This will typically be set to the same
delay as in DDR_SDRAM_CLK_CNTL[CLK_ADJUST]. The timing parameters listed in the table assume that these 2
parameters have been set to the same adjustment value. See the MPC8548E PowerQUICC™ III Integrated Processor
Reference Manual for a description and understanding of the timing modifications enabled by use of these bits.
(MECC), or data mask (MDM). The data strobe should be centered inside of the data eye at the pins of the microprocessor.
symbol conventions described in note 1.
DDKHAS
shows the DDR SDRAM output timing for the MCK to MDQS skew measurement (t
symbolizes DDR timing (DD) for the time t
DDKHMH
(first two letters of functional block)(reference)(state)(signal)(state)
Parameter
For the ADDR/CMD setup and hold specifications in
assumed that the clock control register is set to adjust the memory clocks by
1/2 applied cycle.
MPC8548E PowerQUICC™ III Integrated Processor Hardware Specifications, Rev. 4
follows the symbol conventions described in note 1. For example, t
Table 18. DDR SDRAM Output AC Timing Specifications (continued)
MCK[ n ]
MCK[ n ]
MDQS
MDQS
Figure 3. Timing Diagram for tDDKHMH
DDKLDX
Symbol
t
DDKHME
MCK
symbolizes DDR timing (DD) for the time t
t
DDKHMH(min)
t
memory clock reference (K) goes from the high (H) state until outputs
DDKHMHmax)
1
t
MCK
NOTE
(first two letters of functional block)(signal)(state)(reference)(state)
for outputs. Output hold time can be read as DDR timing
= –0.6 ns
–0.6
= 0.6 ns
Min
Table
DDKHMH
DDKHMH
18, it is
Max
0.6
can be modified through control
describes the DDR timing (DD)
MCK
memory clock reference
DDKHMP
DDR and DDR2 SDRAM
Unit
ns
follows the
DDKHMH
Notes
for
6
23
).