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參數(shù)資料
| 型號： | MPC7457EC |
| 廠商： | 飛思卡爾半導(dǎo)體(中國)有限公司 |
| 英文描述： | RISC Microprocessor Hardware Specifications |
| 中文描述： | RISC微處理器硬件規(guī)格 |
| 文件頁數(shù)： | 21/68頁 |
| 文件大?。?/td> | 1755K |
| 代理商： | MPC7457EC |
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MPC7457 RISC Microprocessor Hardware Specifications, Rev. 5
Freescale Semiconductor
21
Electrical and Thermal Characteristics
The L3_CLK timing diagram is shown in
Figure 7
.
Figure 7. L3_CLK_OUT Output Timing Diagram
L3 clock jitter
—
—
± 75
—
—
± 75
ps
5
Notes
:
1. The maximum L3 clock frequency (and minimum L3 clock period) will be system dependent. See
Section 5.2.3, “L3 Clock
AC Specifications
,” for an explanation that this maximum frequency is not functionally tested at speed by Freescale. The
minimum L3 clock frequency and period are f
SYSCLK
and t
SYSCLK
, respectively.
2. The nominal duty cycle of the L3 output clocks is 50% measured at midpoint voltage.
3. Maximum possible skew between L3_CLK0 and L3_CLK1. This parameter is critical to the address and control signals which
are common to both SRAM chips in the L3.
4. Maximum possible skew between L3_CLK0 and L3_ECHO_CLK1 or between L3_CLK1 and L3_ECHO_CLK3 for PB2 or
Late Write SRAM. This parameter is critical to the read data signals because the processor uses the feedback loop to latch
data driven from the SRAM, each of which drives data based on L3_CLK0 or L3_CLK1.
5. Guaranteed by design and not tested. The input jitter on SYSCLK affects L3 output clocks and the L3 address, data, and
control signals equally and, therefore, is already comprehended in the AC timing and does not have to be considered in the
L3 timing analysis. The clock-to-clock jitter shown here is uncertainty in the internal clock period caused by supply voltage
noise or thermal effects. This is also comprehended in the AC timing specifications and need not be considered in the L3
timing analysis.
6. L3 I/O voltage mode must be configured by L3VSEL as described in
Table 3
, and voltage supplied at GV
DD
must match
mode selected as specified in
Table 4
. See
Table 23
for revision level information and part marking.
Table 10. L3_CLK Output AC Timing Specifications (continued)
At recommended operating conditions. See
Table 4
.
Parameter
Symbol
Device Revision (L3 I/O Voltage)
6
Unit
Notes
Rev 1.1. (All I/O Modes)
Rev 1.2 (1.5-V I/O Mode)
Rev 1.2
(1.8-, 2.5-V I/O Modes)
Min
Typ
Max
Min
Typ
Max
L3_CLK0
VM
t
L3CR
t
L3CF
VM
VM
VM
L3_CLK1
VM
VM
t
L3_CLK
t
CHCL
VM
L3_ECHO_CLK1
L3_ECHO_CLK3
VM
VM
VM
VM
VM
VM
VM
VM
For PB2 or Late Write:
t
L3CSKW1
t
L3CSKW2
t
L3CSKW2
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