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Philips Semiconductors ISP1362 Linux Stack User’s Guide
UM10012-_2 © Koninklijke Philips Electronics N.V. 2003. All rights reserved.
User’s Guide Rev. 1.2—July 2003 7 of 34
2.3. Core Modules
2.3.1. Host Stack
The host stack consists of the Host Controller Driver (HCD) module. The driver is used for data transfer on the
USB bus for the connected devices. This driver can work in parallel with other HCDs (OHCI HCD, UHCI HCD,
EHCI HCD) present in the kernel. This is a kernel module and the Linux OS has support for USB, connected USB
device class drivers and suitable applications.
Figure 2-1: ISP1362 Linux Stack Architecture
2.3.2. Device Stack
The device stack consists of the Device Controller Driver (DCD), the USB protocol driver, and the mass storage
class driver. The DCD is responsible for data transfer over the USB bus. The USB protocol driver responds to the
standard USB protocol requests. The mass storage class driver adds the mass storage functionality to the USB
device, and responds to the mass storage class commands and protocol. The mass storage needs to interface with
the physical mass storage device to perform its operations, and the physical disk is customer platform-specific and
ISP1362 Hardware Access Layer Driver
Mass Storage bridge
Mass Storage disk
emulation
OTG Mass storage demo/
OTG tools
Linux File System
Linux operating system
Linux kernel
ISP1362 Hardware
Mass Storage class driver
USB protocol driver
Device Controller Driver
USB core
USB class drivers
basic device drivers
OTG driver
Host Controller Driver
ISP1362 stack core modules
ISP1362 application modules
Linux kernel drivers
ISP1362 porting modules