Product manual

s TAAC: "ITS n DElNE THE ASYNCHRONOUS PART OF THE READ ACCESS TIME OF THE CARD

4HE BITS ARE DECODED AS FOLLOWS

TAAC bit Code

n 4IME UNIT

0   NS    NS    NS    ±S    ±S    ±S

n 4IME VALUE

0  2ESERVED                  

         !   "   #   $  

E   &  

 2ESERVED

s NSAC: "ITS n DElNE THE WORST CASE FOR THE CLOCKDEPENDENT FACTOR OF THE DATA

ACCESS TIME 4HE UNIT IS  CLOCK CYCLES 4HE TOTAL ACCESS TIME IS EQUAL TO 4!!# PLUS

.3!#

s TRAN_SPEED: "ITS n DElNE THE MAXIMUM DATA TRANSFER RATE 4HE BITS ARE

DECODED AS FOLLOWS

TRAN_SPEED bit Code

n 4RANSFER 2ATE 5NIT

0   KBS    -BS    -BS    -BS

n  2ESERVED

n 4IME 6ALUE

0  2ESERVED                  

         !   "   #   $  

E   &  

 2ESERVED

s CCC: "ITS n DElNE THE COMMAND CLASSES THAT ARE SUPPORTED BY THE CARD 4HE BIT

DElNITIONS ARE AS FOLLOWS

CCC bit Supported card command class

 #LASS 

 #LASS

Field Description Width Bits *Value Code

CRC CRC 7 7–1 —

— Always 1 1 0–0 — 1b

*values are based on a 16 MB SanDisk card.

Table 3.10: CSD Register Bit Deﬁnitions —cont’d

Memory Card 127