EP9302-CQZ Cirrus Logic Inc, EP9302-CQZ Datasheet - Page 307
![IC ARM9 SOC PROCESSOR 208LQFP](/photos/12/23/122385/mfg_ep9302_parts_sml.jpg)
EP9302-CQZ
Manufacturer Part Number
EP9302-CQZ
Description
IC ARM9 SOC PROCESSOR 208LQFP
Manufacturer
Cirrus Logic Inc
Series
EP9r
Datasheets
1.EP9307-CRZ.pdf
(824 pages)
2.EP9302-IQZ.pdf
(42 pages)
3.EP9302-IQZ.pdf
(4 pages)
4.EP9302-IQZ.pdf
(40 pages)
Specifications of EP9302-CQZ
Program Memory Type
ROMless
Package / Case
208-LQFP
Core Processor
ARM9
Core Size
16/32-Bit
Speed
200MHz
Connectivity
EBI/EMI, Ethernet, I²C, IrDA, SPI, UART/USART, USB
Peripherals
AC'97, DMA, I²:S, LED, MaverickKey, POR, PWM, WDT
Number Of I /o
19
Ram Size
32K x 8
Voltage - Supply (vcc/vdd)
1.65 V ~ 3.6 V
Data Converters
A/D 5x12b
Oscillator Type
External
Operating Temperature
0°C ~ 70°C
Processor Series
EP93xx
Core
ARM920T
Data Bus Width
32 bit
Data Ram Size
16 bit
Interface Type
USB, USART, SPI
Maximum Clock Frequency
200 MHz
Number Of Programmable I/os
37
Mounting Style
SMD/SMT
3rd Party Development Tools
MDK-ARM, RL-ARM, ULINK2
Development Tools By Supplier
EDB9302A-Z
Controller Family/series
(ARM9)
No. Of I/o's
19
Ram Memory Size
16MB
Cpu Speed
200MHz
No. Of Timers
4
Embedded Interface Type
AC97, I2S, SPI, UART, USB
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
598-1132 - KIT DEVELOPMENT EP9302 ARM9
Eeprom Size
-
Program Memory Size
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
Other names
598-1137
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- EP9307-CRZ PDF datasheet
- EP9302-IQZ PDF datasheet #2
- EP9302-IQZ PDF datasheet #3
- EP9302-IQZ PDF datasheet #4
- Current page: 307 of 824
- Download datasheet (13Mb)
DS785UM1
9.1.3 Packet Transmission Process
9.1.3.1 Carrier Deference
This section explains the complete packet transmission process as seen on the Ethernet line.
This process includes: carrier deference, back-off, packet transmission, transmission of EOF,
and SQE test. Refer to
The Ethernet/ISO/IEC 8802-3 topology is a single shared medium with several stations. Only
one station can transmit at a time. The access method is called Carrier Sense Multiple
Access with Collision Detection (CSMA/CD). This method is a “listen before talk” mechanism
that has an added feature to end transmissions when two, or more, stations start
transmissions at nearly the same time.
The CSMA portion of this method provides collision avoidance. Each station monitors its
receiver for carrier activity. When activity is detected, the medium is busy, and the MAC
defers (waits) until the medium no longer has a carrier.
Refer to
layer immediately moves to the Carrier Deference State Diagram. The Carrier Deference
state is independent of entry into the state diagram. The MAC layer may enter the state
diagram in any of its five states. The MAC layer exits the Carrier Deference only from the IFG
Transmission
Complete
Report Applicable
Figure
Transmit EOF
Transmit
Status
Start of Transmit
Transmission
Frame in fifo
Deference
9-4. Once sufficient bytes have been written to the transmit FIFO, the MAC
Carrier
Transmit JAM
Figure
There was
a collision
Figure 9-3. Packet Transmission Process
Carrier Deference is
detailed in the next diagram.
Transmission ends with
either completion of the
frame, or a collision.
Copyright 2007 Cirrus Logic
9-3.
The Packet Transmission Process
Report Applicable
Collision
Transmit
Status
Late
?
YES
NO
Report Applicable
The maximum number of
collisions is either 16 or 1
depending on the Onecoll bit
in the transmit descriptor.
number of
Collisions
Transmit
Status
Max
1/10/100 Mbps Ethernet LAN Controller
?
YES
NO
Wait for the duration
of the BackOff Timer
The backoff time is a computed
random number based on either
the standard algorithm or the
modified back-off algorithm.
See the ModBackoffE bit
in TxCTL.
EP93xx User’s Guide
9-5
9
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