EP9315-CB Cirrus Logic Inc, EP9315-CB Datasheet - Page 409

• 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

DS785UM1
10.1.10.4 Data Transfer Termination
The DMA Controller terminates a memory-to-memory channel transfer under the following
conditions:
• For a software-triggered M2M transfer, a memory-write is initiated when the 16-byte data
• For transfers involving external devices or SSP/IDE, the DMA memory-write phase is
• For software-triggered transfers which use a single buffer, the transfer is terminated
• For hardware-triggered transfers involving SSP or IDE or external devices without
• For operations involving external devices using a single buffer, the transfer is terminated
bay has been filled (in the case where 16 or more bytes remain to be transferred) or
when it contains the appropriate number of bytes (equal to BCR register value if BCR is
less than 16). The DMA controller drives the DAR_BASEx onto the address bus. This
address can be any aligned byte address. The BCR register decrements by the
appropriate number of bytes. When BCR = 0 then the transfer is complete. If BCR is
greater than zero, another read/write transfer is initiated.
initiated when the data bay contains the byte/half-word/word data, depending on PW
value, that is, peripheral width. The DMA will then drive the DAR_BASEx onto the
address bus and will set the AMBA HSIZE signal in accordance with the PW value.
Once the DMA has received confirmation that the write is done (from HREADY in case
of an internal memory write, or from the SMC acknowledge signal in case of an external
device write), a wait state counter is started. During the count, the hardware request line
is masked, in order to allow the related peripheral to de-assert its request. In the case of
CONTROL.TM = “01” and the external device (which is the destination for the data) is
FIFO-based, it is up to software to program the DAH bit correctly (Destination Address
Hold), so that on successive transfers to the peripheral, the DAR_CURRENTx value will
not increment, thus reflecting the FIFO-nature of the peripheral.
when the BCR register of the active buffer has reached zero. The DONE status bit and
corresponding interrupt (if enabled) are set. In the case of double/multiple buffer
transfers, termination occurs when the BCR registers of both buffer descriptors has
reached zero. The DONE status bit and corresponding interrupt (if enabled) are set.
When the DONE interrupt is set the processor can then write a one to clear the interrupt
before reprogramming the DMA to carry out another M2M transfer.
handshaking signals, the transfer is also terminated when the BCR register of the active
buffer has reached zero. The DONE status bit and corresponding interrupt (if enabled)
are set. When the DONE interrupt is set, the processor can then write a one to clear the
interrupt before reprogramming the DMA to carry out another external DMA transfer.
on the first occurrence of DEOT being asserted by the device or the byte count expiring
for the active buffer. In the case of the DMA receiving a DEOT from the peripheral (which
is aligned to DREQ) the DMA knows that this is the final transfer to be performed. The
DONE status bit and corresponding interrupt (if enabled) are set. In the case of
double/multiple buffer transfers, termination occurs on either the occurrence of the DMA
receiving a DEOT from the device while it is transferring to/from the last buffer (that is,
no other buffer has been set up), or when the BCR registers of both buffer descriptors
has reached zero.
Copyright 2007 Cirrus Logic
EP93xx User’s Guide
DMA Controller
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