
16
MPC7410 RISC Microprocessor Hardware Specifications
MOTOROLA
Electrical and Thermal Characteristics
Figure 4 provides the AC test load for the MPC7410.
Figure 4. AC Test Load
SYSCLK to ARTRY, SHD0, SHD1 high impedance after
precharge
tKHARPZ
—2
t
SYSCLK
3, 8, 9
Notes:
1. All input specifications are measured from the midpoint of the signal in question to the midpoint of the rising edge
of the input SYSCLK. All output specifications are measured from the midpoint of the rising edge of SYSCLK to the
midpoint of the signal in question. All output timings assume a purely resistive 50-
output timings are measured at the pin; time-of-flight delays must be added for trace lengths, vias, and connectors
in the system.
2. The symbology used for timing specifications herein follows the pattern of t(signal)(state)(reference)(state) for inputs and
t(reference)(state)(signal)(state) for outputs. For example, tIVKH symbolizes the time input signals (I) reach the valid state
(V) relative to the SYSCLK reference (K) going to the high (H) state or input setup time. And tKHOV symbolizes the
time from SYSCLK(K) going high (H) until outputs (O) are valid (V) or output valid time. Input hold time can be read
as the time that the input signal (I) went invalid (X) with respect to the rising clock edge (KH)— note the position of
the reference and its state for inputs—and output hold time can be read as the time from the rising edge (KH) until
the output went invalid (OX).
3. tSYSCLK is the period of the external 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. Includes mode select signals: BVSEL, EMODE, L2VSEL. See
Figure 5 for mode select timing with respect to
HRESET.
5. All other output signals are composed of the following— A[0:31], AP[0:3], TT[0:4], TS, TBST, TSIZ[0:2], GBL, WT,
CI, DH[0:31], DL[0:31], DP[0:7], BR, CKSTP_OUT, DRDY, HIT, QREQ, RSRV.
6. Output valid time is measured from 2.4 to 0.8 V which may be longer than the time required to discharge from VDD
to 0.8 V.
7. According to the 60x bus protocol, ABB and DBB are driven only by the currently active bus master. They are
asserted low then precharged high before returning to high-Z as shown in
Figure 6. The nominal precharge width
for ABB or DBB is 0.5
× t
SYSCLK, that is, less than the minimum tSYSCLK period, to ensure that another master
asserting ABB, or DBB on the following clock will not contend with the precharge. Output valid and output hold
timing is tested for the signal asserted. Output valid time is tested for precharge.The high-Z behavior is guaranteed
by design.
8. According to the 60x bus protocol, ARTRY can be driven by multiple bus masters through the clock period
immediately following AACK. Bus contention is not an issue since any master asserting ARTRY will be driving it
low. Any master asserting it low in the first clock following AACK will then go to high-Z for one clock before
precharging it high during the second cycle after the assertion of AACK. The nominal precharge width for ARTRY
is 1.0 tSYSCLK; that is, it should be high-Z as shown in Figure 6 before the first opportunity for another master to assert ARTRY. Output valid and output hold timing are tested for the signal asserted. Output valid time is tested for
precharge. The high-Z behavior is guaranteed by design.
9. Guaranteed by design and not tested.
Table 8. Processor Bus AC Timing Specifications 1 (continued)
At recommended operating conditions (see Table 3)
Parameter
Symbol 2
400, 450, 500 MHz
Unit
Notes
Min
Max
Output
Z0 = 50
OVDD/2
RL = 50