EP9312-CB Cirrus Logic Inc, EP9312-CB Datasheet - Page 446

• Manufacturer Part Number: EP9312-CB
• Description: System-on-Chip Processor
• Manufacturer: Cirrus Logic Inc
• Series: EP9r

Specifications of EP9312-CB

• Peak Reflow Compatible (260 C): No
• A/d Converter: 12 Bits
• Leaded Process Compatible: No
• No. Of I/o Pins: 65
• Package / Case: 352-BGA
• Core Processor: ARM9
• Core Size: 16/32-Bit
• Speed: 200MHz
• Connectivity: EBI/EMI, EIDE, Ethernet, I²C, IrDA, Keypad/Touchscreen, 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
• Processor Series: EP93xx
• Core: ARM920T
• Data Bus Width: 32 bit
• 3rd Party Development Tools: MDK-ARM, RL-ARM, ULINK2
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Program Memory Size: -
• Lead Free Status / Rohs Status: No
• Other names: 598-1257

11
11-6
Universal Serial Bus Host Controller
EP93xx User’s Guide
11.2.3 Host Controller Driver Responsibilities
11.2.3.1 Host Controller Management
11.2.3.2 Bandwidth Allocation
This section summarizes the Host Controller Driver (HCD) responsibilities.
The Host Controller Driver manages the operation of the Host Controller (HC). It does so by
communicating directly to the operational registers in the Host Controller and establishing the
interrupt Endpoint Descriptor list head pointers in the HCCA.
The Host Controller Driver maintains the state of the HC, list processing pointers, list
processing enables, and interrupt enables.
All access to the USB is scheduled by the Host Controller Driver. The Host Controller Driver
allocates a portion of the available bandwidth to each periodic endpoint. If sufficient
bandwidth is not available, a newly-connected periodic endpoint will be denied access to the
bus.
Interrupt
Head
Pointers
16
24
20
12
28
18
10
26
22
14
30
17
25
21
13
29
19
11
27
23
15
31
0
8
4
2
6
1
9
5
3
7
Figure 11-5. Sample Interrupt Endpoint Schedule
32
Copyright 2007 Cirrus Logic
16
Endpoint Poll Interval (ms)
Interrupt Endpoint Descriptors
8
4
2
1
DS785UM1