MPC8540 datasheet(1068/1302 Pages) FREESCALE

1068 / 1302 page

MPC8540 PowerQUICC III Integrated Host Processor Reference Manual, Rev. 1

18-20

Freescale Semiconductor

Global Utilities

18.4.1.18 Local Bus DLL Control Register (LBDLLCR)

Shown in Figure 18-18, the LBDLLCR contains control bits that allow debug of the local bus

controller’s DLL. The delay chain of the DLL is made up of 128 tap points.

Table 18-21 describes the bit settings of LBDLLCR.

21–23 COURSE_SET Reports the current course delay setting found by the dynamic search algorithm that

produced a lock. Measured in CCB clock cycles

24–31

TAP

Reports the tap value found by the dynamic search algorithm that produced a lock.

Measured in tap points

15 16

OVRD

000 0

COURSE_ADJ

TAP_SEL

0 0 0 0 0 COURSE_SET

TAP

Reset

0000_0000_0000_0000_0000_0000_0000_0000

Offset

0xE_0E20

Figure 18-18. Local Bus DLL Control Register (LBDLLCR)

Table 18-21. LBDLLCR Field Descriptions

Bits

Name

Description

OVRD

Override mode

0 Override mode disabled

1 Override of current delay chain tap point with the TAPSEL tap point enabled

1–4

—

Reserved

5–7

COURSE_ADJ Course adjustment value to be used by the DLL when in override mode (OVRD = 1). The

course adjustment is the number of CCB clock cycles of delay to inject before the delay chain.

When leaving override mode (OVRD cleared) this course adjust point serves as the starting

point for a dynamic search for a lock point.

8–15

TAP_SEL

TAP select value to be used by the DLL when in override mode (OVRD = 1). Selects the tap

point within the delay chain. When leaving override mode (OVRD cleared) this tap point

serves as the starting point for a dynamic search for a lock point.

16–20

—

Reserved

21–23 COURSE_SET Reports the current course delay setting found by the dynamic search algorithm that

produced a lock. Measured in CCB clock cycles

24–31

TAP

Reports the tap value found by the dynamic search algorithm that produced a lock. Measured

in tap points

Table 18-20. DDRDLLCR Field Descriptions (continued)

Bits

Name

Description

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