3.1.2.6 L2 Bus Output AC Specifications
Table 12 provides th e L2 bu s ou tpu t in terface AC tim in g specification s for th e PPC750
as defin ed in Figu re 8 .
1
Table 12. L2 Bus Output Interface AC Timing Specifications
Operating conditions are specified in Section Table 2., "Recommended Operating Conditions" CL = 20 pF3
L2CR[14-15] is equivalent to:
2
Num Characteristic
00
01
10
11
Unit Notes
Min Max Min Max Min Max Min Max
26
27
28
L2SYNC_IN to output
valid
—
5.0
—
5.5
—
Rsv5
—
Rsv5 ns
L2SYNC_IN to output
hold
0.5
—
—
1.0
—
—
Rsv5
—
—
Rsv5
—
—
ns
4
6
L2SYNC_IN to high
impedance
4.0
4.5
Rsv5
Rsv5 ns
Notes:
1. All outputs are measured from the midpoint voltage of the rising edge of L2SYNC_IN to the midpoint
voltage (1.4 V) of the signal in question. The output timings are measured at the pins.
2.The outputs are valid for both single-ended and differential L2CLK modes. For flow-thru and pipelined
reg-reg synchronous burst SRAMs, L2CR[14-15] = 00 is recommended. For pipelined late-write syn-
chronous burst SRAMs, L2CR[14-15] = 01 is recommended.
3. All maximum timing specifications assume CL = 20 pF.
4. This measurement assumes CL= 5 pF.
5. Reserved for future use.
6. Guaranteed by design and characterization, and not tested.
Figu re 8 sh ows th e L2 bu s ou tpu t tim in g diagram s for th e PPC750.
VM
VM
L2SYNC_IN
26
27
ALL OUTPUTS
L2DATA BUS
28
VM = Midpoint Voltage (1.4V)
Figure 8. L2 Bus Output Timing Diagrams
PPC740 and PPC750 Hardware Specifications
17 of 44
Preliminary and subject to change without notice
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