參數(shù)資料
型號(hào): SPD6729QCE
廠商: INTEL CORP
元件分類: 總線控制器
英文描述: PCMCIA BUS CONTROLLER, PQFP208
封裝: MQFP-208
文件頁數(shù): 4/116頁
文件大?。?/td> 1442K
代理商: SPD6729QCE
PCI-to-PC Card (PCMCIA) Controller — PD6729
Datasheet
101
13.3.3
PCMCIA Bus Timing Calculations
Calculations for minimum PCMCIA cycle Setup, Command, and Recovery timings are made by
first calculating factors derived from the applicable timer set’s timing registers and then by
applying the factor to an equation relating it to the internal clock period.
The PCMCIA cycle timing factors, in terms of the number of internal clocks, are calculated as
follows:
S = (Npres × Nval) + 1
C = (Npres × Nval) + 1
R = (Npres × Nval) + 1
Npres and Nval are the specific selected prescalar and multiplier value from the timer set’s Setup,
Command, and Recovery Timing registers (see “Timing Registers” on page 87 for description of
these registers).
From this, a PCMCIA cycle’s Setup, Command, and Recovery time for the selected timer set are
calculated as follows:
Minimum Setup time = (S
× Tcp) 20 ns
Minimum Command time = (C
× Tcp) 20 ns
Minimum Recovery time = (R
× Tcp) 20 ns
Tcp is two times the period of the PCI bus clock connected to the PD6729 PCI_CLK pin.
If PCI_CLK operates at 33 MHz, then:
Tcp = 60 ns
The timing diagrams that follow were derived for a PD6729 using the PCI clock at 33 MHz. The
examples are for the default values of the Timing registers for Timer Set 0, as follows:
Thus the minimum times for the default values are as follows:
Minimum Setup time = (S
× Tcp) 20 ns = {[(1 × 1) + 1] × 60 ns} 20 ns = 100 ns
Minimum Command time = (C
× Tcp) 20 ns = {[(1 × 5) + 1] × 60 ns} 20 ns = 340 ns
Minimum Recovery time = (R
× Tcp) 20 ns = {[(1 × 0) + 1] × 60 ns} 30 ns = 30 ns
Timing Register Name
(Timer Set 0)
Index
Value
(Default)
Resultant
Npres
Resultant Nval
Setup Timing 0
3Ah
01h
1
Command Timing 0
3Bh
05h
1
5
Recovery Timing 0
3Ch
00h
1
0
相關(guān)PDF資料
PDF描述
SPEAR-09-B042 1 CHANNEL(S), 100M bps, I2C BUS CONTROLLER, PBGA289
SPEAR300-2 32-BIT, FLASH, 333 MHz, RISC MICROCONTROLLER, PBGA289
SPL505YC264ATT PROC SPECIFIC CLOCK GENERATOR, PDSO64
SPL505YC264BT 400 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO64
SPL505YC264BT 400 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO64
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SPD6730QCB 制造商:Rochester Electronics LLC 功能描述:- Bulk
SPD6832QCB 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Intel 功能描述:
SPD73 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Shielded Surface Mount Inductors
SPD73-103M 功能描述:固定電感器 10uH 20% .067ohm Shield Choke SMT Pwr RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm
SPD73-103MTR 功能描述:固定電感器 10 UH 20% RoHS:否 制造商:AVX 電感:10 uH 容差:20 % 最大直流電流:1 A 最大直流電阻:0.075 Ohms 工作溫度范圍:- 40 C to + 85 C 自諧振頻率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接類型:SMD/SMT 封裝 / 箱體:6.6 mm x 4.45 mm