VSC7511 datasheet(170/324 Pages) MICROSEMI

170 / 324 page

Functional Descriptions

VMDS-10488 VSC7511 Datasheet Revision 4.2

155

Figure 54 •

Timing Distribution

Each block using timing has a TimeOfDay instance included. These modules let time pass according to

an incoming delta request, instructing it to add the nominal clock period in nanoseconds (+0/+1/–1) for

each system clock cycle. This is controlled by a deltaT function in the DEVCPU, which can be configured

to do regular adjustments to the time by adding a single nanosecond more or less at specified intervals.

The absT function in the DEVCPU can set the full TOD time in the system. This is controlled by the

LoadStore controllers.

The DEVCPU includes four LoadStore controllers, each using a designated GPIO pin on the GPIO

interface. LoadStore controller 0 uses PTP_0 pin; LoadStore controller 1 uses PTP_1 pin, and so forth.

Before using the LoadStore controller, the VCore-III CPU must enable the overlaid functions for the

appropriate GPIO pins. For more information, see GPIO Overlaid Functions, page 204.

Each controller has CPU accessible registers with the full time of day set, and can be configured to load

these into the TimeOfDay instances, or to store the current values from them. The operation can be done

on a detected edge on the associated pin or immediately. The GPIO pin can also generate a clock with

configurable high and low periods set in nanoseconds using the TimeOfDay watches or it can generate a

pulse at a configured time with a configurable duration and polarity.

Table 126 •

LoadStore Controller

Pin Control Field

Function

Action

Load: Load TOD_SEC and TOD_NSEC through the absTime bus.

Delta: Add configured nsec to the current time of day (absT).

Store: Store the current TOD_SEC and TOD_NSEC.

Clock: Generate a clock or a pulse on the pin.

Sync

Execute the load/store on incoming edge, if action is LOAD or STORE.

Generate a pulse instead of clock if action is CLOCK.

Inverse polarity

Falling edges are detected/generated.

TOD_sec

The 48-bit seconds of a time of day set to be loaded or stored.

TOD_nsec

The 30-bit nanoseconds of a time of day set to be loaded or stored.

DeltaT

gen

Adjuster

LoadStore Ctrl

GPIO

AbsT

gen

LoadStore Ctrl

load

TimeOfDay

o o o

store

Four controllers configured for:

- Load absolute time

- Load signed delta time

- Store absolute time

- Generate pulse or clock on pin

Load/store can be done on incoming edge

or immediately.

sec (48 bits)

nsec (30 bits)

nsf (32 bits)

Analyzer / Rewriter / Port Modules

(only NSF in port module)

VSC7511 Datasheet(PDF) 170 Page - Microsemi Corporation

VSC7511 Datasheet(HTML) 170 Page - Microsemi Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL