參數(shù)資料
型號(hào)： romr0002
廠商： SIEMENS AG
英文描述： MultiMediaCard R0002 2 Mbyte ROM(多媒體卡 R0002 2 Mbyte ROM)
中文描述： 多媒體R0002 2字節(jié)的光盤（多媒體卡R0002 2字節(jié)光盤）
文件頁(yè)數(shù)： 16/41頁(yè)
文件大?。?/td> 207K
代理商： ROMR0002
Siemens
Product Manual R0002
Semiconductor Group
16
3.1
6
Communication
All communication between host and cards is controlled by the host (master). The host sends com-
mands and, depending on the command, receives a corresponding response from the selected
card. In this chapter the commands to control the R0002, the card responses and the contents of a
status and error field, included in the responses, are defined.
6.1
Commands
The command set of the MultiMediaCard system is divided into classes corresponding to the type of
card (see also [1]). The R0002 supports the following command classes:
Class 0 is mandatory and supported by all cards. It represents the card identification and initializa-
tion commands, which are intended to handle different cards and card types on the same bus lines.
The Card Command Class (CCC) is coded in the card specific data register of each card, so that
the host knows how to access the card.
There are four kinds of commands defined on the MultiMediaCard bus:
broadcast commands (bc)
sent on CMD line, no response
broadcast commands with response (bcr)
sent on CMD line, response (all cards simultaneously) on CMD line
addressed (point-to-point) commands (ac)
sent on CMD line, response on CMD line
addressed (point-to-point) data transfer commands (adtc)
sent on CMD line, response on CMD line, data transfer on DAT line
The command transmission always starts with the MSB. Each command starts with a start bit and
ends with an CRC command protection field followed by a end bit. The length of each command
frame is fixed to 48 bits (2.4
μ
s @ 20 MHz):
The start bit is always ‘0’ in command frames (sent from host to MultiMediaCard). The host bit is
always ‘1’ for commands. The command field contains the binary coded command number. The
argument depends on the command (see Table 16 and Table 17). The CRC field is defined in
"Chapter 7: Error handling".
1
Cyclic Redundancy Check
Card
Command
Class (CCC)
Class
description
Supported commands
0
1
2
3
4
7
9
10
11
12
13
15
16
17
18
class 0
class 1
class 2
basic
sequential read
block read
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
Table 15: R0002 command classes
0
start bit
1
host
bit 5...bit 0
command
bit 31...bit 0
argument
bit 6...bit 0
CRC
1
1
end bit
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