cl-pd6833 Cirrus Logic, Inc., cl-pd6833 Datasheet - Page 192

• Manufacturer Part Number: cl-pd6833
• Description: Pci-to-cardbus Host Adapter
• Manufacturer: Cirrus Logic, Inc.

15.3.3
Calculations for minimum PC Card (PCMCIA) cycle’s 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 PC Card cycle timing factors, in terms of the number of internal clocks, are calculated as follows:
N
registers (see
From this, a PC Card cycle’s Setup, Command, and Recovery time for the selected timer set are
calculated as follows:
Tcp is the period of the internal clock.
If PCI_CLK is selected (Misc Control 2 register bit 0 is a ‘0’) and operates at 33 MHz, and the clock input
is not being divided (Misc Control 2 register bit 4 is a ‘0’), then:
The timing diagrams that follow were derived for a CL-PD6833 using the PCI clock at 33 MHz. The
examples for the default values of the Timing registers for Timer Set 0 are as follows:
Thus the minimum times for the default values are as follows:
192
Setup Timing 0
Command Timing 0
Recovery Timing 0
val
Minimum Recovery time = (R + 1)
is the specific selected multiplier value from the timer set’s Setup, Command, and Recovery Timing
Minimum Command time = (C
ELECTRICAL SPECIFICATIONS
Minimum Setup time = (S
Timing Register Name
PC Card (PCMCIA) Bus Timing Calculations
Chapter 12
(Timer Set 0)
Minimum Recovery time = (R + 1)
Minimum Command time = (C
Minimum Setup time = (S Tcp)
for the description of these registers).
Tcp)
Tcp)
Tcp
S = N
C = N
R = N
Tcp = 30 ns
10 ns = {[0 + 1]
10 ns = {[7 + 1]
val
val
val
10 ns = {[5 + 1]
+ 1
+ 1
+ 1
Index
3Ch
3Ah
3Bh
I/O
Tcp)
Tcp
10 ns
30 ns}
30 ns}
10 ns
30 ns}
10 ns
ADVANCE DATA BOOK v0.3
(Default)
10 ns = 20 ns
Value
10 ns = 230 ns
00h
07h
04h
10 ns = 170 ns
PCI-to-CardBus Host Adapter
Resultant N
CL-PD6833
Equation 15-10
Equation 15-1
Equation 15-2
Equation 15-3
Equation 15-4
Equation 15-5
Equation 15-6
Equation 15-7
Equation 15-8
Equation 15-9
0
7
4
June 1998
val