MPC8245 datasheet(23/68 Pages) FREESCALE

23 / 68 page

MPC8245 Integrated Processor Hardware Specifications, Rev. 10

Freescale Semiconductor

Electrical and Thermal Characteristics

Figure 13 shows the input timing diagram for mode select signals.

Figure 13. Input Timing Diagram for Mode Select Signals

4.5.3

Output AC Timing Specification

Table 11 provides the processor bus AC timing specifications for the MPC8245 at recommended operating

conditions (see Table 2) with LVDD = 3.3 V ± 0.3 V. See Figure 11 for the input/output timing diagram

referenced to sys_logic_clk. All output timings assume a purely resistive 50-

Ω load (see Figure 14 for the

AC test load for the MPC8245). Output timings are measured at the pin; time-of-flight delays must be

added for trace lengths, vias, and connectors in the system. These specifications are for the default driver

strengths indicated in Table 4.

Table 11. Output AC Timing Specifications

Num

Characteristic

Min

Max

Unit

Notes

12a

PCI_SYNC_IN to output valid, see Figure 15

12a0

Tap 0, PCI_HOLD_DEL=00, [MCP,CKE] = 11, 66 MHz PCI (default)

—

6.0

1, 3

12a1

Tap 1, PCI_HOLD_DEL=01, [MCP,CKE] = 10

—

6.5

12a2

Tap 2, PCI_HOLD_DEL=10, [MCP,CKE] = 01, 33 MHz PCI

—

7.0

12a3

Tap 3, PCI_HOLD_DEL=11, [MCP,CKE] = 00

—

7.5

12b

sys_logic_clk to output valid (memory control, address, and data signals)

—

4.0

12c

sys_logic_clk to output valid (for all others)

—

7.0

12d

sys_logic_clk to output valid (for I2C)

—

5.0

12e

sys_logic_clk to output valid (ROM/Flash/PortX)

—

6.0

13a

Output hold (PCI), see Figure 15

13a0

Tap 0, PCI_HOLD_DEL=00, [MCP,CKE] = 11, 66-MHz PCI (default)

2.0

—

1, 3, 4

13a1

Tap 1, PCI_HOLD_DEL=01, [MCP,CKE] = 10

2.5

—

13a2

Tap 2, PCI_HOLD_DEL=10, [MCP,CKE] = 01, 33-MHz PCI

3.0

—

13a3

Tap 3, PCI_HOLD_DEL=11, [MCP,CKE] = 00

3.5

—

13b

Output hold (all others)

1.0

—

14a

PCI_SYNC_IN to output high impedance (for PCI)

—

14.0

1, 3

VM = Midpoint Voltage (1.4 V)

11b

Mode Pins

10e

HRST_CPU/HRST_CTRL

2.0 V

0.8 V

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