ENICSF2811PBKA datasheet(126/172 Pages) TI1

126 / 172 page

TMS320F2810, TMS320F2811, TMS320F2812

TMS320C2810, TMS320C2811, TMS320C2812

SPRS174T – APRIL 2001 – REVISED MAY 2012

www.ti.com

6.22 External Interface (XINTF) Timing

Each XINTF access consists of three parts: Lead, Active, and Trail. The user configures the

Lead/Active/Trail wait states in the XTIMING registers. There is one XTIMING register for each XINTF

zone. Table 6-30 shows the relationship between the parameters configured in the XTIMING register and

the duration of the pulse in terms of XTIMCLK cycles.

Table 6-30. Relationship Between Parameters Configured in XTIMING and Duration of Pulse(1)(2)

DURATION (ns)

DESCRIPTION

X2TIMING = 0

X2TIMING = 1

Lead period, read access

XRDLEAD × tc(XTIM)

(XRDLEAD × 2) × tc(XTIM)

Active period, read access

(XRDACTIVE + WS + 1) × tc(XTIM)

(XRDACTIVE × 2 + WS + 1) × tc(XTIM)

Trail period, read access

XRDTRAIL × tc(XTIM)

(XRDTRAIL × 2) × tc(XTIM)

Lead period, write access

XWRLEAD × tc(XTIM)

(XWRLEAD × 2) × tc(XTIM)

Active period, write access

(XWRACTIVE + WS + 1) × tc(XTIM)

(XWRACTIVE × 2 + WS + 1) × tc(XTIM)

Trail period, write access

XWRTRAIL × tc(XTIM)

(XWRTRAIL × 2) × tc(XTIM)

(1)

tc(XTIM) – Cycle time, XTIMCLK

(2)

WS refers to the number of wait states inserted by hardware when using XREADY. If the zone is configured to ignore XREADY

(USEREADY = 0), then WS = 0.

Minimum wait state requirements must be met when configuring each zone’s XTIMING register. These

requirements are in addition to any timing requirements as specified by that device’s data sheet. No

internal device hardware is included to detect illegal settings.

●

If the XREADY signal is ignored (USEREADY = 0), then:

Lead:

≥ tc(XTIM)

These requirements result in the following XTIMING register configuration restrictions (no hardware to

detect illegal XTIMING configurations):

XRDLEAD

XRDACTIVE

XRDTRAIL

XWRLEAD

XWRACTIVE

XWRTRAIL

X2TIMING

≥ 1

≥ 0

≥ 1

≥ 0

0, 1

Examples of valid and invalid timing when not sampling XREADY (no hardware to detect illegal XTIMING

configurations):

XRDLEAD

XRDACTIVE

XRDTRAIL

XWRLEAD

XWRACTIVE

XWRTRAIL

X2TIMING

Invalid

0, 1

Valid

0, 1

126

Electrical Specifications

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