User's Manual

T
T
T
S
S
S
1
1
1
6
6
6
G
G
G
~
~
~
6
6
6
4
4
4
G
G
G
C
C
C
F
F
F
4
4
4
0
0
0
0
0
0 400X CompactFlash Card
Transcend Information Inc.
V1.0
49
Host Configuration Requirements for Master/Slave or New Timing Modes
The CF Advanced Timing modes include PCMCIA PC Card style I/O modes that are faster than the original 250 ns
cycle time. These modes are not supported by the PCMCIA PC Card specification nor CF by cards based on revisions
of the CF specification before Revision 3.0. Hosts shall ensure that all cards accessed through a common electrical
interface are capable of operation at the desired, faster than 250 ns, I/O mode before configuring the interface for that
I/O mode.
Advanced Timing modes are PCMCIA PC Card style I/O modes that are 100 ns or faster, PC Card Memory modes
that are 100ns or faster, True IDE PIO Modes 5,6 and Multiword DMA Modes 3,4. These modes are permitted to be
used only when a single card is present and the host and card are connected directly, without a cable exceeding 0.15m
in length. Consequently, the host shall not configure a card into an Advanced Timing Mode if two cards are sharing I/O
lines, as in Master/Slave operation, nor if it is constructed such that a cable exceeding 0.15 meters is required to
connect the host to the card.
The load presented to the Host by cards supporting Ultra DMA is more controlled than that presented by other
CompactFlash cards. Therefore, the use of a card that does not support Ultra DMA in a Master/Slave arrangement
with a Ultra DMA card can affect the critical timing of the Ultra DMA transfers. The host shall not configure a card into
Ultra DMA mode when a card not supporting Ultra DMA is also present on the same interface
When the use of two cards on an interface is otherwise permitted, the host may use any mode that is supported by
both cards, but to achieve maximum performance it should use its highest performance mode that is also supported
by both cards.
Metaformat Overview
The goal of the Metaformat is to describe the requirements and capabilities of the CompactFlash Storage Card as
thoroughly as possible. This includes describing the power requirements, IO requirements, memory requirements,
manufacturer information and details about the services provided.
Table: Sample Device Info Tuple Information for Extended Speeds
Note: The value “1” defined for D3 of the N+0 words indicates that no write-protect switch controls writing
the ATA
registers. The value “0” defined for D7 in the N+2 words indicates that there is not more than
a single speed
extension byte.