8X930AX datasheet(20/38 Pages) INTEL

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ADVANCE INFORMATION

8x930Ax UNIVERSAL SERIAL BUS (USB) MICROCONTROLLER

5.4

AC Characteristics

Test Conditions: Capacitive load on all pins = 50 pF, Rise and Fall times = 10 ns, F

OSC = 6 MHz or 12 MHz

5.4.1

SYSTEM BUS AC CHARACTERISTICS

Table 11. AC Characteristics at Operating Conditions

Symbol

Parameter

CPU Frequency

@ 12 MHz

(M, N = 0)

CPU Frequency (F

CLK) Variable

Units

Min

Max

CLK

1/(CPU Frequency)

83.33

(Typical)

(1, 2)

LHLL

ALE Pulse Width

34.66

(0.5+M)T

CLK – 7

ns (3)

AVLL

Address Valid to ALE Low

26.66

(0.5+M)T

CLK –

ns (3)

LLAX

Address Hold after ALE Low

ns (4)

RLRH (5)

RD# or PSEN# Pulse Width

73.33

(1+N)T

CLK – 10

ns (6)

WLWH

WR# Pulse Width

71.33

(1+N)T

CLK – 12

ns (6)

LLRL (5)

ALE Low to RD# or PSEN# Low

LHAX

ALE High to Address Hold

40.33

(1+M)T

CLK – 43

ns (3)

RLDV (5)

RD# or PSEN# Low to Valid

Data/Instruction In

50.33

(1+N)T

CLK – 33

ns (6)

RHDX (5)

Data/Instruct. Hold After RD# or

PSEN# High

RLAZ (5)

RD# or PSEN# Low to Address

Float

RHDZ

1 (5)

Instruct. Float After PSEN# High

RHDZ

2 (5)

Data Float After RD# or PSEN#

High

83.33

CLK

RHLH

1 (5)

PSEN# High to ALE High

(Instruction)

RHLH

2 (5)

RD# or PSEN# High to ALE

High (Data)

83.33

CLK

WHLH

WR# High to ALE High

88.33

CLK + 5

AVDV

Address (P0) Valid to Valid

Data/Instruction In

106.66

(2+M+N)T

CLK –

(3, 6)

NOTES:

Refer to Table 8 on page 12 for CPU frequencies vs. XTAL1 frequencies.

XTAL1 frequency is

± 0.25% for full speed and ± 1.5% for low speed.

M= 0,1 is the extended ALE state.

At 50° C, T

LLAX = 8 ns

Specifications for PSEN# are identical to those for RD#.

N= 0,1,2,3 is the RD#/PSEN#/WR# wait state.

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