PowerPC 750FL RISC Microprocessor
Preliminary
3.5 60x Bus Output ac Specifications
Table 3-9 provides the 60x bus output ac timing specifications for the 750FL microprocessor as defined and
defined in Figure 3-6 Output Timing Diagram for PowerPC 750FL RISC Microprocessor on page 26.
Table 3-9. 60x Bus Output ac Timing Specifications 1, 5, 8
1.8 V Mode
2.5 V Mode
3.3 V Mode
Reference
Number
Characteristic
Unit Notes
ns
Minimum
Maximum
Minimum
Maximum
Minimum
Maximum
SYSCLK to output driven
(Output Enable Time)
12
13
14
0.3
0.5
0.3
0.3
SYSCLK to output valid
2.3
2.5
2.5
–
ns
ns
2, 6
2, 7
SYSCLK to output invalid
(Output Hold)
0.55
0.55
SYSCLK to output high
impedance (all signals
except ARTRY, ABB and
DBB)
15
2.5
2.5
2.5
ns
SYSCLK to ABB and DBB
high impedance after pre-
charge
16
17
1.0
3.0
1.0
3.0
1.0
3.0
tSYSCLK 3, 4
SYSCLK to ARTRY
high impedance
ns
before precharge
SYSCLK to ARTRY pre-
charge enable
0.2 ×
tSYSCLK + 1.0
0.2 ×
tSYSCLK + 1.0
0.2 ×
tSYSCLK + 1.0
18
19
ns
2, 3, 4
MaximumdelaytoARTRY
precharge
1.0
2.0
1.0
2.0
1.0
2.0
tSYSCLK 3, 4
SYSCLK to ARTRY
high impedance
after precharge
20
tSYSCLK 3, 4
Notes:
1. All output specifications are measured from the VM of the rising edge of SYSCLK to the output signal level defined in Figure 3-5
Output Valid Timing Definition on page 25. Both input and output timings are measured at the pin. Timings are determined by
design.
2. This minimum parameter assumes CL = 0 pF.
3. tSYSCLK is the period of the external bus clock (SYSCLK) in ns. The numbers given in the table must be multiplied by the period of
SYSCLK to compute the actual time duration (in ns) of the parameter in question.
4. Nominal precharge width for ARTRY is 1.0 tSYSCLK
.
5. Guaranteed by design and characterization and not tested.
6. Output valid timing increases as the VDD in reduced. These values assume a minimum VDD of 1.35 V.
7. See Section 3.6 Alternate I/O Timing for 3.3 V Bus on page 26.
8. See Table 3-2 Recommended Operating Conditions on page 17 for operating conditions.
Electrical and Thermal Characteristics
Page 24 of 65
750flds60.fm.6.0
April 27, 2007
IBM [ IBM ]
