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參數(shù)資料
| 型號： | MPC8555VTALD |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 32-BIT, 667 MHz, RISC PROCESSOR, PBGA783 |
| 封裝： | 29 X 29 MM, 3.75 MM HEIGHT, 1 MM PITCH, LEAD FREE, FLIP CHIP, PLASTIC, BGA-783 |
| 文件頁數(shù)： | 29/88頁 |
| 文件大?。?/td> | 772K |
| 代理商： | MPC8555VTALD |
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MPC8555E PowerQUICC III Integrated Communications Processor Hardware Specification, Rev. 3.1
Freescale Semiconductor
35
Local Bus
Figure 15 provides the AC test load for the local bus.
Figure 15. Local Bus C Test Load
Local bus clock to data valid for LAD/LDP
LWE[0:1] = 00
tLBKLOV2
—0.7
ns
3
LWE[0:1] = 11 (default)
2.2
Local bus clock to address valid for LAD
LWE[0:1] = 00
tLBKLOV3
—0.8
ns
3
LWE[0:1] = 11 (default)
2.3
Output hold from local bus clock (except
LAD/LDP and LALE)
LWE[0:1] = 00
tLBKLOX1
-2.7
—
ns
3
LWE[0:1] = 11 (default)
-1.8
Output hold from local bus clock for
LAD/LDP
LWE[0:1] = 00
tLBKLOX2
-2.7
—
ns
3
LWE[0:1] = 11 (default)
-1.8
Local bus clock to output high Impedance
(except LAD/LDP and LALE)
LWE[0:1] = 00
tLBKLOZ1
—1.0
ns
5
LWE[0:1] = 11 (default)
2.4
Local bus clock to output high impedance
for LAD/LDP
LWE[0:1] = 00
tLBKLOZ2
—1.0
ns
5
LWE[0:1] = 11 (default)
2.4
Notes:
1. The symbols used for timing specifications herein follow the pattern of t(First two letters of functional block)(signal)(state)
(reference)(state) for inputs and t(First two letters of functional block)(reference)(state)(signal)(state) for outputs. For example, tLBIXKH1
symbolizes local bus timing (LB) for the input (I) to go invalid (X) with respect to the time the tLBK clock reference (K) goes
high (H), in this case for clock one(1). Also, tLBKHOX symbolizes local bus timing (LB) for the tLBK clock reference (K) to go
high (H), with respect to the output (O) going invalid (X) or output hold time.
2. All timings are in reference to LSYNC_IN for DLL enabled mode.
3. All signals are measured from OVDD/2 of the rising edge of local bus clock for DLL bypass mode to 0.4 × OVDD of the signal
in question for 3.3-V signaling levels.
4. Input timings are measured at the pin.
5. For purposes of active/float timing measurements, the Hi-Z or off state is defined to be when the total current delivered
through the component pin is less than or equal to the leakage current specification.
6. The value of tLBOTOT is defined as the sum of 1/2 or 1 ccb_clk cycle as programmed by LBCR[AHD], and the number of local
bus buffer delays used as programmed at power-on reset with configuration pins LWE[0:1].
7. Maximum possible clock skew between a clock LCLK[m] and a relative clock LCLK[n]. Skew measured between
complementary signals at OVDD/2.
8. Guaranteed by characterization.
9. Guaranteed by design.
Table 31. Local Bus General Timing Parameters - DLL Bypassed (continued)
Parameter
Configuration 7
Symbol 1
Min
Max
Unit
Notes
Output
Z0 = 50
OVDD/2
RL = 50
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