MPC8347 FREESCALE [Freescale Semiconductor, Inc], MPC8347 Datasheet - Page 21

• Manufacturer Part Number: MPC8347
• Description: Integrated Host Processor Hardware Specifications
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Figure 4
Freescale Semiconductor
At recommended operating conditions with GV
MDQS epilogue end
Note:
1. The symbols 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. For the
4. 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
and t
the rising or falling edge of the reference clock (KH or KL) until the output goes invalid (AX or DX). For example, t
symbolizes DDR timing (DD) for the time t
set up (S) or output valid time. Also, t
low (L) until data outputs (D) are invalid (X) or data output hold time.
ADDR/CMD setup and hold specifications, it is assumed that the clock control register is set to adjust the memory clocks by
1/2 applied cycle.
rising edge of the MCK(n) clock (KH) until the MDQS signal is valid (MH). t
DQSS override bits in the TIMING_CFG_2 registerand is typically set to the same delay as the clock adjust in the CLK_CNTL
register. The timing parameters listed in the table assume that these two parameters are set to the same adjustment value.
See the MPC8349EA PowerQUICC II Pro Integrated Processor Reference Manual for the timing modifications enabled by
use of these bits.
(MECC), or data mask (MDM). The data strobe should be centered inside the data eye at the pins of the microprocessor.
symbol conventions described in note 1.
DDKHMH
(first two letters of functional block)(reference)(state)(signal)(state)
shows the DDR SDRAM output timing for the MCK to MDQS skew measurement (t
follows the symbol conventions described in note 1. For example, t
MPC8347EA PowerQUICC II Pro Integrated Host Processor Hardware Specifications, Rev. 3
Table 19. DDR and DDR2 SDRAM Output AC Timing Specifications (continued)
Parameter
MCK[n]
MCK[n]
MDQS
MDQS
DDKLDX
Figure 4. Timing Diagram for t
DD
of (1.8 V or 2.5 V) ± 5%.
MCK
symbolizes DDR timing (DD) for the time t
memory clock reference (K) goes from the high (H) state until outputs (A) are
t
t
DDKHMHmax) = 0.6 ns
DDKHMH(min) = –0.6 ns
Symbol
for outputs. Output hold time can be read as DDR timing (DD) from
t
DDKHME
(first two letters of functional block)(signal)(state) (reference)(state)
t
MCK
1
DDKHMH
DDKHMH
DDKHMH
–0.6
Min
can be modified through control of the
describes the DDR timing (DD) from the
MCK
memory clock reference (K) goes
Max
0.6
DDKHMP
DDR and DDR2 SDRAM
Unit
follows the
ns
DDKHMH
for inputs
DDKHAS
Notes
6
21
).