Samsung S5PC100 User Manual page 943

SD/MMC CONTROLLER
4.7 TIMEOUT SETTING FOR DAT LINE
In order to detect timeout errors on DAT line, the Host Driver executes the following two steps before any SD
transaction.
(1) To calculate a divisor for detecting timeout, refer to Timeout Control Register.
(2) Set Data Timeout Counter Value (TIMEOUTCON) in the Timeout Control register in accordance with the
value of step (1).
4.8 SD TRANSACTION GENERATION
This section describes the sequence to generate and control various kinds of SD transactions. SD transactions
are classified into three cases:
(1) Transactions that do not use the DAT line.
(2) Transactions that use the DAT line for the busy signal.
(3) Transactions that use the DAT line for transferring data.
In this specification the first and the second case's transactions are classified as "Transaction Control without
Data Transfer using DAT Line", the third case's transaction is classified as "Transaction Control with Data
Transfer using DAT Line".
Please refer to the specifications below for the detailed specifications on the SD Command itself:
•
SD Memory Card Specification Part 1
PHYSICAL LAYER SPECIFICATION Version 1.01
•
SD Card Specification PART E1
Secure Digital Input/Output (SDIO) Specification Version 1.00
8.12-8
START
(1)
Calculate a Divisor for detecting Timeout
(2)
Set Timeout Detection Timer
END
Figure 8.12-8 Timeout Setting Sequence
S5PC100 USER'S MANUAL (REV1.0)