Motorola MPC5200 Manual de usuario descargar pdf (Pagina 14)

MPC5200 Data Sheet, Rev. 4

Electrical and Thermal Characteristics

Freescale Semiconductor14

3.2.4 G2_LE Core PLL Electrical Characteristics

The internal clocking of the G2_LE core is generated from and synchronized to the system clock by means

of a voltage-controlled core PLL.

3.3 AC Electrical Characteristics

Hyperlinks to the indicated timing specification sections are provided below.

AC Test Timing Conditions:

Unless otherwise noted, all test conditions are as follows:

Table 11. G2_LE PLL Specifications

Characteristic Symbol Notes Min Typical Max Unit SpecID

G2_LE frequency f

core

NOTES:

The XLB_CLK frequency and G2_LE PLL Configuration bits must be chosen such that the resulting system

frequencies, CPU (core) frequency, and G2_LE PLL (VCO) frequency do not exceed their respective maximum or

minimum operating frequencies.

50 — 550 MHz O4.1

G2_LE cycle time t

core

(1)

2.85 — 40.0 ns O4.2

G2_LE VCO frequency f

VCOcore

(1)

400 — 1200 MHz O4.3

G2_LE input clock frequency f

XLB_CLK

25 — 367 MHz O4.4

G2_LE input clock cycle time t

XLB_CLK

2.73 — 50.0 ns O4.5

G2_LE input clock jitter t

jitter

This represents total input jitter - short term and long term combined - and is guaranteed by design. Two different

types of jitter can exist on the input to core_sysclk, systemic and true random jitter. True random jitter is rejected, but

the PLL. Systemic jitter will be passed into and through the PLL to the internal clock circuitry, directly reducing the

operating frequency.

— — 150 ps O4.6

G2_LE PLL relock time t

lock

Relock time is guaranteed by design and characterization. PLL-relock time is the maximum amount of time required

for the PLL lock after a stable Vdd and core_sysclk are reached during the power-on reset sequence. This

specification also applies when the PLL has been disabled and subsequently re-enabled during sleep modes.

— — 100 µsO4.7

• AC Operating Frequency Data • USB

• Clock AC Specifications • SPI

•Resets •MSCAN

• External Interrupts • I

• SDRAM • J1850

•PCI •PSC

• Local Plus Bus • GPIOs and Timers

• ATA • IEEE 1149.1 (JTAG) AC Specifications

• Ethernet

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