EP9315-CB Cirrus Logic Inc, EP9315-CB Datasheet - Page 330

• Manufacturer Part Number: EP9315-CB
• Description: IC ARM920T MCU 200MHZ 352-PBGA
• Manufacturer: Cirrus Logic Inc
• Series: EP9r

Specifications of EP9315-CB

• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, EIDE, Ethernet, I²C, IrDA, Keypad/Touchscreen, PCMCIA, SPI, UART/USART, USB
• Peripherals: AC'97, DMA, I&sup2:S, LCD, LED, MaverickKey, POR, PWM, WDT
• Number Of I /o: 16
• Program Memory Type: ROMless
• Ram Size: 32K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 3.6 V
• Data Converters: A/D 8x12b
• Oscillator Type: External
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 352-BGA
• Processor Series: EP93xx
• Core: ARM920T
• Data Bus Width: 32 bit
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Development Tools By Supplier: EDB9315A-Z
• For Use With: 598-1144 - KIT DEVELOPMENT EP9315 ARM9
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: No
• Other names: 598-1261

9
Transmit Descriptor Format - First Word
9-28
1/10/100 Mbps Ethernet LAN Controller
EP93xx User’s Guide
9.2.3.9 Transmit Descriptor Format
31
15
register sizes are in bits,
and shown in parentheses ().
Definition:
EOF = 0
EOF = 0
EOF = 1
In the example shown in
MAC starts the frame by acquiring the medium and transmitting the preamble. Then, the
fragments 0, 1, 2 are transmitted in order for a total of 446 bytes (39 + 388 + 19). Since the
CRC bit in the first frame fragment is clear, the HW appends the 4 byte CRC. Thus, 4 more
bytes are added to the frame for the CRC making the total frame length 450 bytes. Finally, the
MAC sends the end-of-frame.
The CMD field is 4 bits. Only the AF bit is valid. The other fields are reserved.
30
14
Example: Fragments 0, 1, 2 make-up one complete frame.
EOF
EOF
EOF
29
13
Index 0 (15)
Index 0 (15)
Index 0 (15)
Buffer
Buffer
Buffer
28
12
T x B u fA d r 0 ( 3 2 )
T x D B u f A d r 1 ( 3 2 )
T x D B u f A d r 2 ( 3 2 )
Transmit Descriptor, first word. Contains the base address of the data buffer.
Figure 9-14. Multiple Fragments Per Transmit Frame
27
11
CMD
CMD
CMD
(4)
(4)
(4)
Figure
Length 0 (12)
Length 0 (12)
Length 0 (12)
26
10
Buffer
Buffer
Buffer
Copyright 2007 Cirrus Logic
9-14, one frame is transmitted from three fragments. The
25
9
24
8
TBA
TBA
23
7
22
6
21
5
Data Fragment 0
Data Fragment 1
Data Fragment 2
20
4
19
3
18
2
Fragment 0
Fragment 1
Fragment 2
388 bytes
89 bytes
19 bytes
Length
Length
Length
17
1
DS785UM1
16
0